Fixes for -Wunused-function on Linux, Android and ChromeOS

gpu/command_buffer/tests/gl_virtual_contexts_unittests.cc

 // Copyright (c) 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.
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 30 matching lines @@
   }
 
   GLManager gl_real_;
   GLManager gl_real_shared_;
   GLManager gl1_;
   GLManager gl2_;
 };
 
 namespace {
 
+#if !defined(OS_ANDROID)
 void SetupSimpleShader(const uint8* color) {
   static const char* v_shader_str = SHADER(
       attribute vec4 a_Position;
       void main()
       {
          gl_Position = a_Position;
       }
    );
 
   static const char* f_shader_str = SHADER(
@@ skipping 22 matching lines @@
 }
 
 void TestDraw(int size) {
   uint8 expected_clear[] = { 127, 0, 255, 0, };
   glClearColor(0.5f, 0.0f, 1.0f, 0.0f);
   glClear(GL_COLOR_BUFFER_BIT);
   EXPECT_TRUE(GLTestHelper::CheckPixels(0, 0, size, size, 1, expected_clear));
   glDrawArrays(GL_TRIANGLES, 0, 6);
 }
 
+#endif  // !defined(OS_ANDROID)
+
 }  // anonymous namespace
 
 // http://crbug.com/281565
 #if !defined(OS_ANDROID)
 TEST_F(GLVirtualContextsTest, Basic) {
   struct TestInfo {
     int size;
     uint8 color[4];
     GLManager* manager;
   };
@@ skipping 30 matching lines @@
     const TestInfo& test = tests[ii];
     GLManager* gl_manager = test.manager;
     gl_manager->MakeCurrent();
     GLTestHelper::CheckGLError("no errors", __LINE__);
   }
 }
 #endif
 
 }  // namespace gpu