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

cc/debug/fake_web_graphics_context_3d.cc

 // 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.
 
 #include "cc/debug/fake_web_graphics_context_3d.h"
 
 #include "third_party/khronos/GLES2/gl2.h"
 
 using WebKit::WGC3Dboolean;
 using WebKit::WGC3Denum;
@@ skipping 134 matching lines @@
     WebKit::WGC3Dint* value) {
   if (pname == GL_COMPILE_STATUS)
     *value = 1;
 }
 
 WebKit::WebString FakeWebGraphicsContext3D::getShaderInfoLog(
     WebGLId shader) {
   return WebKit::WebString();
 }
 
+void FakeWebGraphicsContext3D::getShaderPrecisionFormat(
+    WebKit::WGC3Denum shadertype,
+    WebKit::WGC3Denum precisiontype,
+    WebKit::WGC3Dint* range,
+    WebKit::WGC3Dint* precision) {
+  range[0] = 0;
+  range[1] = 0;
+  *precision = 0;
+}
+
 WebKit::WebString FakeWebGraphicsContext3D::getShaderSource(
     WebGLId shader) {
   return WebKit::WebString();
 }
 
 WebKit::WebString FakeWebGraphicsContext3D::getString(WGC3Denum name) {
   return WebKit::WebString();
 }
 
 WebKit::WGC3Dint FakeWebGraphicsContext3D::getUniformLocation(
@@ skipping 125 matching lines @@
 
 void FakeWebGraphicsContext3D::setContextLostCallback(
     WebGraphicsContextLostCallback* callback) {
 }
 
 void FakeWebGraphicsContext3D::loseContextCHROMIUM(WGC3Denum current,
                                                    WGC3Denum other) {
 }
 
 }  // namespace cc