cc: Use highp precision for texture coordinates if available

cc/fake_web_graphics_context_3d.h

 // Copyright 2013 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 CC_FAKE_WEB_GRAPHICS_CONTEXT_3D_H_
 #define CC_FAKE_WEB_GRAPHICS_CONTEXT_3D_H_
 
 #include "base/compiler_specific.h"
 #include "cc/cc_export.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
@@ skipping 267 matching lines @@
   virtual void getShaderiv(
       WebKit::WebGLId shader,
       WebKit::WGC3Denum pname,
       WebKit::WGC3Dint* value);
 
   virtual WebKit::WebString getShaderInfoLog(WebKit::WebGLId shader);
   virtual void getShaderPrecisionFormat(
       WebKit::WGC3Denum shadertype,
       WebKit::WGC3Denum precisiontype,
       WebKit::WGC3Dint* range,
-      WebKit::WGC3Dint* precision) {}
+      WebKit::WGC3Dint* precision);
   virtual WebKit::WebString getShaderSource(WebKit::WebGLId shader);
   virtual WebKit::WebString getString(WebKit::WGC3Denum name);
   virtual void getTexParameterfv(
       WebKit::WGC3Denum target,
       WebKit::WGC3Denum pname,
       WebKit::WGC3Dfloat* value) {}
   virtual void getTexParameteriv(
       WebKit::WGC3Denum target,
       WebKit::WGC3Denum pname,
       WebKit::WGC3Dint* value) {}
@@ skipping 281 matching lines @@
   virtual void setContextLostCallback(
       WebGraphicsContextLostCallback* callback);
 
   virtual void loseContextCHROMIUM(WebKit::WGC3Denum current,
                                    WebKit::WGC3Denum other);
 };
 
 }  // namespace cc
 
 #endif  // CC_FAKE_WEB_GRAPHICS_CONTEXT_3D_H_