Merge 126540 - [chromium] Fix lost context when textures are evicted

Source/WebCore/platform/graphics/chromium/cc/CCSingleThreadProxy.cpp

Index: Source/WebCore/platform/graphics/chromium/cc/CCSingleThreadProxy.cpp
===================================================================
--- Source/WebCore/platform/graphics/chromium/cc/CCSingleThreadProxy.cpp	(revision 126622)
+++ Source/WebCore/platform/graphics/chromium/cc/CCSingleThreadProxy.cpp	(working copy)
@@ -156,7 +156,8 @@
     bool initialized;
     {
         DebugScopedSetImplThread impl;
-        m_layerTreeHost->deleteContentsTexturesOnImplThread(m_layerTreeHostImpl->resourceProvider());
+        if (!m_layerTreeHostImpl->contentsTexturesPurged())
+            m_layerTreeHost->deleteContentsTexturesOnImplThread(m_layerTreeHostImpl->resourceProvider());
         initialized = m_layerTreeHostImpl->initializeLayerRenderer(context.release(), UnthrottledUploader);
         if (initialized) {
             m_layerRendererCapabilitiesForMainThread = m_layerTreeHostImpl->layerRendererCapabilities();