Implementation of 2D canvas context lost/restored events

Source/platform/graphics/ImageBufferSurface.cpp

Index: Source/platform/graphics/ImageBufferSurface.cpp
diff --git a/Source/platform/graphics/ImageBufferSurface.cpp b/Source/platform/graphics/ImageBufferSurface.cpp
index 63689f23d5e6dec89fb75d0f303ee1cdfc3f5f33..2869f4cc29ae5a05d3d2daffbcf23b52930bd775 100644
--- a/Source/platform/graphics/ImageBufferSurface.cpp
+++ b/Source/platform/graphics/ImageBufferSurface.cpp
@@ -32,11 +32,19 @@
 
 #include "platform/graphics/ImageBufferSurface.h"
 
+#include "platform/graphics/ImageBuffer.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkDevice.h"
 
 namespace WebCore {
 
+ImageBufferSurface::ImageBufferSurface(const IntSize& size, OpacityMode opacityMode)
+    : m_opacityMode(opacityMode)
+    , m_size(size)
+{
+    setIsHidden(false);
+}
+
 void ImageBufferSurface::clear()
 {
     // Clear the background transparent or opaque, as required. It would be nice if this wasn't