url: Update URLSearchParams' constructor arguments.

Adapt to whatwg/url#175, which dropped
URLSearchParams itself from the union accepted by the constructor. The
constructor now takes an optional

  (sequence<sequence<USVString>> or record<USVString, USVString> or USVString)

instead. Existing uses of `new URLSearchParams(<existing URLSearchParam>)`
continue to work, as per WebIDL these objects are converted to sequences
because URLSearchParams is iterable.

Intent to ship/implement thread:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/AGyufsf5XU4/CBeVLmT7BgAJ

Bug: 680531, 697378
Change-Id: Ie82d1151acc4334628be0cc258bc20e5a0dc1d15
Reviewed-on: https://chromium-review.googlesource.com/544919
Commit-Queue: Raphael Kubo da Costa (rakuco) <raphael.kubo.da.costa@intel.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#482588}

third_party/WebKit/LayoutTests/external/wpt/url/urlsearchparams-constructor-expected.txt

@@ -3,7 +3,7 @@ PASS Basic URLSearchParams construction
 PASS URLSearchParams constructor, no arguments 
 FAIL URLSearchParams constructor, DOMException.prototype as argument Illegal invocation
 PASS URLSearchParams constructor, empty string as argument 
-FAIL URLSearchParams constructor, {} as argument assert_equals: expected "" but got "%5Bobject+Object%5D="
+PASS URLSearchParams constructor, {} as argument 
 PASS URLSearchParams constructor, string. 
 PASS URLSearchParams constructor, object. 
 PASS Parse + 
@@ -17,10 +17,10 @@ PASS Parse %e2%8e%84
 PASS Parse 💩 
 PASS Parse %f0%9f%92%a9 
 PASS Constructor with sequence of sequences of strings 
-FAIL Construct with object with + assert_array_equals: property 0, expected "+" but got "[object Object]"
-FAIL Construct with object with two keys assert_array_equals: property 0, expected "c" but got "[object Object]"
+PASS Construct with object with + 
+PASS Construct with object with two keys 
 PASS Construct with array with two keys 
-FAIL Construct with object with NULL, non-ASCII, and surrogate keys assert_array_equals: property 0, expected "a\0b" but got "[object Object]"
-FAIL Custom [Symbol.iterator] assert_equals: expected (string) "b" but got (object) null
+PASS Construct with object with NULL, non-ASCII, and surrogate keys 
+PASS Custom [Symbol.iterator] 
 Harness: the test ran to completion.
 

third_party/WebKit/LayoutTests/fast/domurl/urlsearchparams-constructor.html

@@ -55,8 +55,6 @@
     var params = new URLSearchParams('');
     assert_not_equals(params, null, 'constructor returned non-null value.');
     assert_equals(params.__proto__, URLSearchParams.prototype, 'expected URLSearchParams.prototype as prototype.');
-    params = new URLSearchParams({});
-    assert_equals(params + '', '%5Bobject+Object%5D=');
 }, 'URLSearchParams constructor, empty.');
 
 test(function() {
@@ -91,7 +89,7 @@
     assert_false(params.has('e'));
     params.append('g', 'h');
     assert_false(seed.has('g'));
-}, 'URLSearchParams constructor, object.');
+}, 'sequence initializer, object coerced to iterable');
 
 test(function() {
     var params = new URLSearchParams('a=b+c');
@@ -180,6 +178,18 @@
       "Sequence elements must be pairs");
 }, 'sequence initializer');
 
+test(function() {
+    let params = new URLSearchParams({});
+    assert_true(params !== null, 'Empty record');
+    assert_equals(params.toString(), '');
+
+    params = new URLSearchParams({1: 2, 'a': 'b'});
+    assert_equals(params.toString(), '1=2&a=b');
+
+    params = new URLSearchParams({false: true, 0: 'foo'});
+    assert_equals(params.toString(), '0=foo&false=true');
+}, 'record initializer');
+
 </script>
 </head>
 </html>

third_party/WebKit/Source/bindings/core/v8/BUILD.gn

@@ -73,8 +73,8 @@ bindings_core_generated_union_type_files = [
   "$bindings_core_v8_output_dir/StringOrFloat.h",
   "$bindings_core_v8_output_dir/StringOrUnrestrictedDoubleSequence.cpp",
   "$bindings_core_v8_output_dir/StringOrUnrestrictedDoubleSequence.h",
-  "$bindings_core_v8_output_dir/USVStringSequenceSequenceOrUSVStringOrURLSearchParams.cpp",
-  "$bindings_core_v8_output_dir/USVStringSequenceSequenceOrUSVStringOrURLSearchParams.h",
+  "$bindings_core_v8_output_dir/USVStringSequenceSequenceOrUSVStringUSVStringRecordOrUSVString.cpp",
+  "$bindings_core_v8_output_dir/USVStringSequenceSequenceOrUSVStringUSVStringRecordOrUSVString.h",
   "$bindings_core_v8_output_dir/UnrestrictedDoubleOrKeyframeAnimationOptions.cpp",
   "$bindings_core_v8_output_dir/UnrestrictedDoubleOrKeyframeAnimationOptions.h",
   "$bindings_core_v8_output_dir/UnrestrictedDoubleOrKeyframeEffectOptions.cpp",

third_party/WebKit/Source/core/dom/URLSearchParams.cpp

@@ -48,11 +48,10 @@ URLSearchParams* URLSearchParams::Create(const URLSearchParamsInit& init,
       return new URLSearchParams(query_string.Substring(1));
     return new URLSearchParams(query_string);
   }
-  // TODO(sof): copy constructor no longer in the spec,
-  // consider removing.
-  if (init.isURLSearchParams())
-    return new URLSearchParams(init.getAsURLSearchParams());
-
+  if (init.isUSVStringUSVStringRecord()) {
+    return URLSearchParams::Create(init.getAsUSVStringUSVStringRecord(),
+                                   exception_state);
+  }
   if (init.isUSVStringSequenceSequence()) {
     return URLSearchParams::Create(init.getAsUSVStringSequenceSequence(),
                                    exception_state);
@@ -87,9 +86,16 @@ URLSearchParams::URLSearchParams(const String& query_string, DOMURL* url_object)
     SetInput(query_string);
 }
 
-URLSearchParams::URLSearchParams(URLSearchParams* search_params) {
-  DCHECK(search_params);
-  params_ = search_params->params_;
+URLSearchParams* URLSearchParams::Create(
+    const Vector<std::pair<String, String>>& init,
+    ExceptionState& exception_state) {
+  URLSearchParams* instance = new URLSearchParams(String());
+  if (init.IsEmpty())
+    return instance;
+  for (const auto& item : init)
+    instance->AppendWithoutUpdate(item.first, item.second);
+  instance->RunUpdateSteps();
+  return instance;
 }
 
 URLSearchParams::~URLSearchParams() {}

third_party/WebKit/Source/core/dom/URLSearchParams.h

@@ -8,7 +8,7 @@
 #include <base/gtest_prod_util.h>
 #include <utility>
 #include "bindings/core/v8/Iterable.h"
-#include "bindings/core/v8/USVStringSequenceSequenceOrUSVStringOrURLSearchParams.h"
+#include "bindings/core/v8/USVStringSequenceSequenceOrUSVStringUSVStringRecordOrUSVString.h"
 #include "platform/bindings/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
 #include "platform/network/EncodedFormData.h"
@@ -20,7 +20,7 @@ namespace blink {
 class ExceptionState;
 class DOMURL;
 
-typedef USVStringSequenceSequenceOrUSVStringOrURLSearchParams
+typedef USVStringSequenceSequenceOrUSVStringUSVStringRecordOrUSVString
     URLSearchParamsInit;
 
 class CORE_EXPORT URLSearchParams final
@@ -31,6 +31,8 @@ class CORE_EXPORT URLSearchParams final
 
  public:
   static URLSearchParams* Create(const URLSearchParamsInit&, ExceptionState&);
+  static URLSearchParams* Create(const Vector<std::pair<String, String>>&,
+                                 ExceptionState&);
   static URLSearchParams* Create(const Vector<Vector<String>>&,
                                  ExceptionState&);
 
@@ -65,7 +67,6 @@ class CORE_EXPORT URLSearchParams final
   FRIEND_TEST_ALL_PREFIXES(URLSearchParamsTest, EncodedFormData);
 
   explicit URLSearchParams(const String&, DOMURL* = nullptr);
-  explicit URLSearchParams(URLSearchParams*);
 
   void RunUpdateSteps();
   IterationSource* StartIteration(ScriptState*, ExceptionState&) override;

third_party/WebKit/Source/core/dom/URLSearchParams.idl

@@ -5,7 +5,7 @@
 // https://url.spec.whatwg.org/#interface-urlsearchparams
 
 [
-    Constructor(optional (sequence<sequence<USVString>> or USVString or URLSearchParams) init = ""),
+    Constructor(optional (sequence<sequence<USVString>> or record<USVString, USVString> or USVString) init = ""),
     Exposed=(Window,Worker),
     RaisesException=Constructor
 ] interface URLSearchParams {