Fixing performance issue of creating imagebitmap from ImageData

third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp

Index: third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp b/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
index d63909e4b47783dfea59bfdc68f16d8b8df9cda8..df902c960517c4c27b1e137126dee76fa1e68c57 100644
--- a/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
@@ -41,6 +41,7 @@
 #include "platform/graphics/ImageBufferClient.h"
 #include "platform/graphics/StaticBitmapImage.h"
 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
+#include "platform/graphics/UnacceleratedSimpleImageBufferSurface.h"
 #include "platform/graphics/gpu/DrawingBuffer.h"
 #include "platform/graphics/gpu/Extensions3DUtil.h"
 #include "platform/graphics/skia/SkiaUtils.h"
@@ -75,6 +76,14 @@ PassOwnPtr<ImageBuffer> ImageBuffer::create(const IntSize& size, OpacityMode opa
     return adoptPtr(new ImageBuffer(surface.release()));
 }
 
+PassOwnPtr<ImageBuffer> ImageBuffer::createSimple(const IntSize& size, OpacityMode opacityMode)
+{
+    OwnPtr<ImageBufferSurface> surface(adoptPtr(new UnacceleratedSimpleImageBufferSurface(size, opacityMode)));
+    if (!surface->isValid())
+        return nullptr;
+    return adoptPtr(new ImageBuffer(surface.release()));
+}
+
 ImageBuffer::ImageBuffer(PassOwnPtr<ImageBufferSurface> surface)
     : m_snapshotState(InitialSnapshotState)
     , m_surface(surface)