Refactoring ImageBuffer to decouple it from Canvas2DLayerBridge

Source/platform/graphics/filters/FilterEffect.cpp

Index: Source/platform/graphics/filters/FilterEffect.cpp
diff --git a/Source/platform/graphics/filters/FilterEffect.cpp b/Source/platform/graphics/filters/FilterEffect.cpp
index 81ca797c029bd88a516fae8c0b95d1c5685b0fca..9ea8f75574baa08200813bd83b88233d8f9c131a 100644
--- a/Source/platform/graphics/filters/FilterEffect.cpp
+++ b/Source/platform/graphics/filters/FilterEffect.cpp
@@ -26,7 +26,9 @@
 #include "platform/graphics/filters/FilterEffect.h"
 
 #include "platform/graphics/ImageBuffer.h"
+#include "platform/graphics/UnacceleratedImageBufferSurface.h"
 #include "platform/graphics/filters/Filter.h"
+#include "platform/graphics/gpu/AcceleratedImageBufferSurface.h"
 
 #if HAVE(ARM_NEON_INTRINSICS)
 #include <arm_neon.h>
@@ -243,7 +245,9 @@ ImageBuffer* FilterEffect::asImageBuffer()
         return 0;
     if (m_imageBufferResult)
         return m_imageBufferResult.get();
-    m_imageBufferResult = ImageBuffer::create(m_absolutePaintRect.size(), 1, m_filter->renderingMode());
+    if (!createImageBufferResult())
+        return 0;
+
     IntRect destinationRect(IntPoint(), m_absolutePaintRect.size());
     if (m_premultipliedImageResult)
         m_imageBufferResult->putByteArray(Premultiplied, m_premultipliedImageResult.get(), destinationRect.size(), destinationRect, IntPoint());
@@ -380,10 +384,12 @@ ImageBuffer* FilterEffect::createImageBufferResult()
     ASSERT(!hasResult());
     if (m_absolutePaintRect.isEmpty())
         return 0;
-    m_imageBufferResult = ImageBuffer::create(m_absolutePaintRect.size(), 1, m_filter->renderingMode());
-    if (!m_imageBufferResult)
-        return 0;
-    ASSERT(m_imageBufferResult->context());
+    OwnPtr<ImageBufferSurface> surface;
+    if (m_filter->isAccelerated())
+        surface = adoptPtr(new AcceleratedImageBufferSurface(m_absolutePaintRect.size()));
+    if (!surface || !surface->isValid())
+        surface = adoptPtr(new UnacceleratedImageBufferSurface(m_absolutePaintRect.size()));
+    m_imageBufferResult = ImageBuffer::create(surface.release());
     return m_imageBufferResult.get();
 }