Implement CSSPaintValue and add a layout test.

third_party/WebKit/Source/modules/csspaint/CSSPaintDefinition.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/csspaint/CSSPaintDefinition.h"
 
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8BindingMacros.h"
 #include "bindings/core/v8/V8ObjectConstructor.h"
@@ skipping 48 matching lines @@
       m_paint(scriptState->isolate(), paint),
       m_didCallConstructor(false),
       m_hasAlpha(hasAlpha) {
   m_nativeInvalidationProperties.swap(nativeInvalidationProperties);
   m_customInvalidationProperties.swap(customInvalidationProperties);
   m_inputArgumentTypes.swap(inputArgumentTypes);
 }
 
 CSSPaintDefinition::~CSSPaintDefinition() {}
 
-PassRefPtr<Image> CSSPaintDefinition::paint(const LayoutObject& layoutObject,
-                                            const IntSize& size,
-                                            float zoom) {
+PassRefPtr<Image> CSSPaintDefinition::paint(
+    const LayoutObject& layoutObject,
+    const IntSize& size,
+    float zoom,
+    const CSSStyleValueVector* paintArguments) {
+  DCHECK(paintArguments);
+
   const IntSize specifiedSize = getSpecifiedSize(size, zoom);
 
   ScriptState::Scope scope(m_scriptState.get());
 
   maybeCreatePaintInstance();
 
   v8::Isolate* isolate = m_scriptState->isolate();
   v8::Local<v8::Object> instance = m_instance.newLocal(isolate);
 
   // We may have failed to create an instance class, in which case produce an
   // invalid image.
   if (isUndefinedOrNull(instance))
     return nullptr;
 
   DCHECK(layoutObject.node());
 
   PaintRenderingContext2D* renderingContext = PaintRenderingContext2D::create(
       ImageBuffer::create(WTF::wrapUnique(
           new RecordingImageBufferSurface(size, nullptr /* fallbackFactory */,
                                           m_hasAlpha ? NonOpaque : Opaque))),
       m_hasAlpha, zoom);
   PaintSize* paintSize = PaintSize::create(specifiedSize);
   StylePropertyMap* styleMap = FilteredComputedStylePropertyMap::create(
       CSSComputedStyleDeclaration::create(layoutObject.node()),
       m_nativeInvalidationProperties, m_customInvalidationProperties,
       layoutObject.node());
 
   v8::Local<v8::Value> argv[] = {

[ikilpatrick, 2017/02/21 17:40:36]

you'll probably need to surround this with  "if
(RuntimeEnabledFeature::isInput...)" to switch between 3 and 4 arg versions.

[renjieliu1, 2017/02/22 04:47:54]

Done.

       ToV8(renderingContext, m_scriptState->context()->Global(), isolate),
       ToV8(paintSize, m_scriptState->context()->Global(), isolate),
-      ToV8(styleMap, m_scriptState->context()->Global(), isolate)};
+      ToV8(styleMap, m_scriptState->context()->Global(), isolate),
+      ToV8(*paintArguments, m_scriptState->context()->Global(), isolate)};
 
   v8::Local<v8::Function> paint = m_paint.newLocal(isolate);
 
   v8::TryCatch block(isolate);
   block.SetVerbose(true);
 
   V8ScriptRunner::callFunction(paint, m_scriptState->getExecutionContext(),
-                               instance, 3, argv, isolate);
+                               instance, 4, argv, isolate);
 
   // The paint function may have produced an error, in which case produce an
   // invalid image.
   if (block.HasCaught()) {
     return nullptr;
   }
 
   return PaintGeneratedImage::create(
       renderingContext->imageBuffer()->getRecord(), specifiedSize);
 }
@@ skipping 11 matching lines @@
   v8::Local<v8::Object> paintInstance;
   if (V8ObjectConstructor::newInstance(isolate, constructor)
           .ToLocal(&paintInstance)) {
     m_instance.set(isolate, paintInstance);
   }
 
   m_didCallConstructor = true;
 }
 
 }  // namespace blink