Enable removing uploads to evicted textures from texture upload queues.

cc/CCLayerTreeHost.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CCLayerTreeHost_h
 #define CCLayerTreeHost_h
 
 #include "CCAnimationEvents.h"
 #include "CCGraphicsContext.h"
 #include "CCLayerTreeHostClient.h"
@@ skipping 176 matching lines @@
 
     void setBackgroundColor(SkColor color) { m_backgroundColor = color; }
 
     void setHasTransparentBackground(bool transparent) { m_hasTransparentBackground = transparent; }
 
     CCPrioritizedTextureManager* contentsTextureManager() const;
 
     // Delete contents textures' backing resources until they use only bytesLimit bytes. This may
     // be called on the impl thread while the main thread is running.
     void reduceContentsTexturesMemoryOnImplThread(size_t bytesLimit, CCResourceProvider*);
+    // Returns true if there any evicted backing textures that have not been deleted.
+    bool evictedContentsTexturesBackingsExist() const;
     // Retrieve the list of all contents textures' backings that have been evicted, to pass to the
     // main thread to unlink them from their owning textures.
     void getEvictedContentTexturesBackings(CCPrioritizedTextureManager::BackingVector&);
     // Unlink the list of contents textures' backings from their owning textures on the main thread
     // before updating layers.
     void unlinkEvictedContentTexturesBackings(const CCPrioritizedTextureManager::BackingVector&);
     // Deletes all evicted backings, unlinking them from their owning textures if needed.
     // Returns true if this function had to unlink any backings from their owning texture when
     // destroying them. If this was the case, the impl layer tree may contain invalid resources.
     bool deleteEvictedContentTexturesBackings();
@@ skipping 88 matching lines @@
 
     TextureList m_deleteTextureAfterCommitList;
     size_t m_partialTextureUpdateRequests;
 
     static bool s_needsFilterContext;
 };
 
 }
 
 #endif