cc: Apply the layer's initial CSS scale to the contentsScale to render text at the right resolution.

cc/LayerChromium.h

 // Copyright 2010 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 LayerChromium_h
 #define LayerChromium_h
 
 #if USE(ACCELERATED_COMPOSITING)
 
@@ skipping 208 matching lines @@
     // That is, it converts from logical, non-page-scaled, to target pixels (and if the target is the
     // root render surface, then this converts to physical pixels).
     const WebKit::WebTransformationMatrix& drawTransform() const { return m_drawTransform; }
     void setDrawTransform(const WebKit::WebTransformationMatrix& matrix) { m_drawTransform = matrix; }
     // This moves from content space, with origin the top left to screen space with origin in the top left.
     // It converts logical, non-page-scaled pixels to physical pixels.
     const WebKit::WebTransformationMatrix& screenSpaceTransform() const { return m_screenSpaceTransform; }
     void setScreenSpaceTransform(const WebKit::WebTransformationMatrix& matrix) { m_screenSpaceTransform = matrix; }
     const IntRect& drawableContentRect() const { return m_drawableContentRect; }
     void setDrawableContentRect(const IntRect& rect) { m_drawableContentRect = rect; }
+
     // The contentsScale converts from logical, non-page-scaled pixels to target pixels.
     // The contentsScale is 1 for the root layer as it is already in physical pixels.
     float contentsScale() const { return m_contentsScale; }
     void setContentsScale(float);
+    // The scale from the initial CSS transform of the layer, including its ancestors, but
+    // not including the deviceScaleFactor or pageScaleFactor.
+    float initialCssScale() const { return m_initialCssScale; }
+    void setInitialCssScale(float scale) { m_initialCssScale = scale; }
 
     // When true, the layer's contents are not scaled by the current page scale factor.
     void setBoundsContainPageScale(bool);
     bool boundsContainPageScale() const { return m_boundsContainPageScale; }
 
     // Returns true if any of the layer's descendants has content to draw.
     bool descendantDrawsContent();
 
     CCLayerTreeHost* layerTreeHost() const { return m_layerTreeHost; }
 
@@ skipping 120 matching lines @@
     LayerChromium* m_renderTarget;
 
     WebKit::WebTransformationMatrix m_drawTransform;
     WebKit::WebTransformationMatrix m_screenSpaceTransform;
     bool m_drawTransformIsAnimating;
     bool m_screenSpaceTransformIsAnimating;
 
     // Uses target surface space.
     IntRect m_drawableContentRect;
     float m_contentsScale;
+    float m_initialCssScale;
     bool m_boundsContainPageScale;
 
     WebKit::WebAnimationDelegate* m_layerAnimationDelegate;
     WebKit::WebLayerScrollClient* m_layerScrollClient;
 };
 
 void sortLayers(Vector<RefPtr<LayerChromium> >::iterator, Vector<RefPtr<LayerChromium> >::iterator, void*);
 
 }
 #endif // USE(ACCELERATED_COMPOSITING)
 
 #endif