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 20 matching lines @@
   virtual void CopyTexture(Parameters parameters) = 0;
   virtual void Flush() = 0;
 
   virtual ~TextureCopier() {}
 };
 
 class CC_EXPORT AcceleratedTextureCopier : public TextureCopier {
  public:
   static scoped_ptr<AcceleratedTextureCopier> Create(
       WebKit::WebGraphicsContext3D* context,
-      bool using_bind_uniforms) {
+      bool using_bind_uniforms,
+      int highp_threshold_min) {
     return make_scoped_ptr(
-        new AcceleratedTextureCopier(context, using_bind_uniforms));
+        new AcceleratedTextureCopier(
+            context, using_bind_uniforms, highp_threshold_min));
   }
   virtual ~AcceleratedTextureCopier();
 
   virtual void CopyTexture(Parameters parameters) OVERRIDE;
   virtual void Flush() OVERRIDE;
 
  protected:
   AcceleratedTextureCopier(WebKit::WebGraphicsContext3D* context,
-                           bool using_bind_uniforms);
+                           bool using_bind_uniforms,
+                           int highp_threshold_min);
 
  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_;
+  int highp_threshold_min_;
 
   DISALLOW_COPY_AND_ASSIGN(AcceleratedTextureCopier);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_TEXTURE_COPIER_H_