Fix issue incremental upload can evict textures being drawn

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 "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/own_ptr_vector.h"
@@ skipping 151 matching lines @@
     const IntSize& deviceViewportSize() const { return m_deviceViewportSize; }
 
     void setPageScaleFactorAndLimits(float pageScaleFactor, float minPageScaleFactor, float maxPageScaleFactor);
 
     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();
-
     bool visible() const { return m_visible; }
     void setVisible(bool);
 
     void startPageScaleAnimation(const IntSize& targetPosition, bool useAnchor, float scale, double durationSec);
 
     void applyScrollAndScale(const CCScrollAndScaleSet&);
     void setImplTransform(const WebKit::WebTransformationMatrix&);
 
     void startRateLimiter(WebKit::WebGraphicsContext3D*);
     void stopRateLimiter(WebKit::WebGraphicsContext3D*);
@@ skipping 81 matching lines @@
     size_t m_partialTextureUpdateRequests;
 
     static bool s_needsFilterContext;
 
     DISALLOW_COPY_AND_ASSIGN(CCLayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif