Add drawImage() originClean() getSecurityOrigin() to OffscreenCanvas

third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp

Index: third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp
diff --git a/third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp b/third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp
index b29be4df2562f67099e7aa9968280a82a549d3fe..b10144a195422c117d117f691c8dd3a1c6ae0776 100644
--- a/third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp
+++ b/third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp
@@ -14,6 +14,7 @@ namespace blink {
 
 OffscreenCanvas::OffscreenCanvas(const IntSize& size)
     : m_size(size)
+    , m_originClean(true)
 {
 }
 
@@ -102,6 +103,13 @@ void OffscreenCanvas::registerRenderingContextFactory(PassOwnPtr<CanvasRendering
     renderingContextFactories()[type] = std::move(renderingContextFactory);
 }
 
+bool OffscreenCanvas::originClean() const
+{
+    // TODO(crbug.com/607575): Make Settings accessable in worker and use
+    // disableReadingFromCanvas to determine originClean value.
+    return m_originClean;
+}
+
 DEFINE_TRACE(OffscreenCanvas)
 {
     visitor->trace(m_context);