Enable removing uploads to evicted textures from texture upload queues.

cc/CCPrioritizedTextureManager.h

 // Copyright 2012 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 CCPrioritizedTextureManager_h
 #define CCPrioritizedTextureManager_h
 
 #include "CCPrioritizedTexture.h"
 #include "CCPriorityCalculator.h"
 #include "CCTexture.h"
@@ skipping 39 matching lines @@
     size_t memoryAboveCutoffBytes() const { return m_memoryAboveCutoffBytes; }
     size_t memoryForSelfManagedTextures() const { return m_maxMemoryLimitBytes - m_memoryAvailableBytes; }
 
     void setMaxMemoryLimitBytes(size_t bytes) { m_maxMemoryLimitBytes = bytes; }
     size_t maxMemoryLimitBytes() const { return m_maxMemoryLimitBytes; }
 
     void prioritizeTextures();
     void clearPriorities();
 
     void reduceMemoryOnImplThread(size_t limitBytes, CCResourceProvider*);
+    bool evictedBackingsExist() const { return !m_evictedBackings.isEmpty(); }
     void getEvictedBackings(BackingVector& evictedBackings);
     void unlinkEvictedBackings(const BackingVector& evictedBackings);
     // Deletes all evicted backings, unlinking them from their owning textures if needed.
-    // Returns true if this function to unlinked any backings from their owning texture while
+    // Returns true if this function unlinked any backings from their owning texture while
     // destroying them.
     bool deleteEvictedBackings();
 
     bool requestLate(CCPrioritizedTexture*);
 
     void reduceMemory(CCResourceProvider*);
     void clearAllMemory(CCResourceProvider*);
 
     void acquireBackingTextureIfNeeded(CCPrioritizedTexture*, CCResourceProvider*);
 
@@ skipping 62 matching lines @@
     BackingVector m_tempBackingVector;
 
     // Set by the main thread when it adjust priorities in such a way that
     // the m_backings array's view of priorities is now out of date.
     bool m_needsUpdateBackingsPrioritites;
 };
 
 } // cc
 
 #endif