Chromium compositor change implementing page-scale driven pinch-zoom.

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 "cc/own_ptr_vector.h"
 #include "CCAnimationEvents.h"
@@ skipping 172 matching lines @@
     // 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*);
 
     // RateLimitClient implementation
     virtual void rateLimit() OVERRIDE;
 
     bool bufferedUpdates();
     bool requestPartialTextureUpdate();
     void deleteTextureAfterCommit(PassOwnPtr<CCPrioritizedTexture>);
@@ skipping 56 matching lines @@
     IntSize m_deviceViewportSize;
     float m_deviceScaleFactor;
 
     bool m_visible;
 
     typedef HashMap<WebKit::WebGraphicsContext3D*, RefPtr<RateLimiter> > RateLimiterMap;
     RateLimiterMap m_rateLimiters;
 
     float m_pageScaleFactor;
     float m_minPageScaleFactor, m_maxPageScaleFactor;
+    WebKit::WebTransformationMatrix m_implTransform;
     bool m_triggerIdleUpdates;
 
     SkColor m_backgroundColor;
     bool m_hasTransparentBackground;
 
     typedef OwnPtrVector<CCPrioritizedTexture> TextureList;
     TextureList m_deleteTextureAfterCommitList;
     size_t m_partialTextureUpdateRequests;
 
     static bool s_needsFilterContext;
 
     DISALLOW_COPY_AND_ASSIGN(CCLayerTreeHost);
 };
 
 }
 
 #endif