Add "alpha" option to PaintWorklet

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

 // 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.
 
 #ifndef CSSPaintDefinition_h
 #define CSSPaintDefinition_h
 
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "core/CSSPropertyNames.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/heap/Handle.h"
 #include <v8.h>
 
 namespace blink {
 
 class Image;
 class LayoutObject;
 class ScriptState;
 
 // Represents a javascript class registered on the PaintWorkletGlobalScope by
 // the author.
 class CSSPaintDefinition final : public GarbageCollectedFinalized<CSSPaintDefinition> {
 public:
-    static CSSPaintDefinition* create(ScriptState*, v8::Local<v8::Function> constructor, v8::Local<v8::Function> paint, Vector<CSSPropertyID>&, Vector<AtomicString>& customInvalidationProperties);
+    static CSSPaintDefinition* create(ScriptState*, v8::Local<v8::Function> constructor, v8::Local<v8::Function> paint, Vector<CSSPropertyID>&, Vector<AtomicString>& customInvalidationProperties, bool hasAlpha);
     virtual ~CSSPaintDefinition();
 
     // Invokes the javascript 'paint' callback on an instance of the javascript
     // class. The size given will be the size of the PaintRenderingContext2D
     // given to the callback.
     //
     // This may return a nullptr (representing an invalid image) if javascript
     // throws an error.
     PassRefPtr<Image> paint(const LayoutObject&, const IntSize&);
     const Vector<CSSPropertyID>& nativeInvalidationProperties() const { return m_nativeInvalidationProperties; }
     const Vector<AtomicString>& customInvalidationProperties() const { return m_customInvalidationProperties; }
+    bool hasAlpha() const { return m_hasAlpha; }
 
     ScriptState* getScriptState() const { return m_scriptState.get(); }
 
     v8::Local<v8::Function> paintFunctionForTesting(v8::Isolate* isolate) { return m_paint.newLocal(isolate); }
 
     DEFINE_INLINE_TRACE() { };
 
 private:
-    CSSPaintDefinition(ScriptState*, v8::Local<v8::Function> constructor, v8::Local<v8::Function> paint, Vector<CSSPropertyID>& nativeInvalidationProperties, Vector<AtomicString>& customInvalidationProperties);
+    CSSPaintDefinition(ScriptState*, v8::Local<v8::Function> constructor, v8::Local<v8::Function> paint, Vector<CSSPropertyID>& nativeInvalidationProperties, Vector<AtomicString>& customInvalidationProperties, bool hasAlpha);
 
     void maybeCreatePaintInstance();
 
     RefPtr<ScriptState> m_scriptState;
 
     // This object keeps the class instance object, constructor function and
     // paint function alive. This object needs to be destroyed to break a
     // reference cycle between it and the PaintWorkletGlobalScope.
     ScopedPersistent<v8::Function> m_constructor;
     ScopedPersistent<v8::Function> m_paint;
 
     // At the moment there is only ever one instance of a paint class per type.
     ScopedPersistent<v8::Object> m_instance;
 
     bool m_didCallConstructor;
 
     Vector<CSSPropertyID> m_nativeInvalidationProperties;
     Vector<AtomicString> m_customInvalidationProperties;
+    bool m_hasAlpha;
 };
 
 } // namespace blink
 
 #endif // CSSPaintDefinition_h