cc: Use highp precision for texture coords if available and needed

cc/output/texture_copier.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 CC_OUTPUT_TEXTURE_COPIER_H_
 #define CC_OUTPUT_TEXTURE_COPIER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
@@ skipping 41 matching lines @@
                            bool using_bind_uniforms);
 
  private:
   typedef ProgramBinding<VertexShaderPosTexIdentity, FragmentShaderRGBATex>
       BlitProgram;
 
   WebKit::WebGraphicsContext3D* context_;
   GLuint fbo_;
   GLuint position_buffer_;
   scoped_ptr<BlitProgram> blit_program_;
+  scoped_ptr<BlitProgram> blit_program_highp_;
   bool using_bind_uniforms_;
 
   DISALLOW_COPY_AND_ASSIGN(AcceleratedTextureCopier);
 };
 
 }
 
 #endif  // CC_OUTPUT_TEXTURE_COPIER_H_