Bug 756601 - Use CreateThebesSurfaceAliasForDrawTarget_hack in CopyableCanvasLayer. r=roc

gfx/layers/CopyableCanvasLayer.cpp

@@ -43,7 +43,7 @@ CopyableCanvasLayer::Initialize(const Data& aData)
     // `GLScreenBuffer::Morph`ing is only needed in BasicShadowableCanvasLayer.
   } else if (aData.mDrawTarget) {
     mDrawTarget = aData.mDrawTarget;
-    mSurface = gfxPlatform::GetPlatform()->GetThebesSurfaceForDrawTarget(mDrawTarget);
+    mSurface = gfxPlatform::GetPlatform()->CreateThebesSurfaceAliasForDrawTarget_hack(mDrawTarget);
     mNeedsYFlip = false;
   } else {
     NS_ERROR("CanvasLayer created without mSurface, mDrawTarget or mGLContext?");