Add CCDelegatingRenderer, and corresponding IPCs

cc/CCLayerTreeHost.cpp

Index: cc/CCLayerTreeHost.cpp
diff --git a/cc/CCLayerTreeHost.cpp b/cc/CCLayerTreeHost.cpp
index ebd227e155fb8c17a473887f8e943575956eb18f..8003a513ecbdde63185f05eb233bba28b89cdaaa 100644
--- a/cc/CCLayerTreeHost.cpp
+++ b/cc/CCLayerTreeHost.cpp
@@ -61,7 +61,6 @@ CCLayerTreeSettings::~CCLayerTreeSettings()
 
 RendererCapabilities::RendererCapabilities()
     : bestTextureFormat(0)
-    , contextHasCachedFrontBuffer(false)
     , usingPartialSwap(false)
     , usingAcceleratedPainting(false)
     , usingSetVisibility(false)
@@ -69,6 +68,7 @@ RendererCapabilities::RendererCapabilities()
     , usingGpuMemoryManager(false)
     , usingDiscardFramebuffer(false)
     , usingEglImage(false)
+    , allowPartialTextureUpdates(true)
     , maxTextureSize(0)
 {
 }
@@ -165,7 +165,7 @@ void CCLayerTreeHost::initializeRenderer()
     m_settings.acceleratePainting = m_proxy->rendererCapabilities().usingAcceleratedPainting;
 
     // Update m_settings based on partial update capability.
-    m_settings.maxPartialTextureUpdates = min(m_settings.maxPartialTextureUpdates, m_proxy->maxPartialTextureUpdates());
+    m_settings.maxPartialTextureUpdates = m_proxy->rendererCapabilities().allowPartialTextureUpdates ? min(m_settings.maxPartialTextureUpdates, m_proxy->maxPartialTextureUpdates()) : 0;
 
     m_contentsTextureManager = CCPrioritizedTextureManager::create(0, m_proxy->rendererCapabilities().maxTextureSize, CCRenderer::ContentPool);
     m_surfaceMemoryPlaceholder = m_contentsTextureManager->createTexture(IntSize(), GraphicsContext3D::RGBA);