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

gpu/command_buffer/tests/gl_virtual_contexts_unittests.cc

Index: gpu/command_buffer/tests/gl_virtual_contexts_unittests.cc
diff --git a/gpu/command_buffer/tests/gl_virtual_contexts_unittests.cc b/gpu/command_buffer/tests/gl_virtual_contexts_unittests.cc
index fa91220999e380dd7803a93a576e03d1db3d2b19..dcf4c1bab5f4f0b1e7ae1a3559f39b798ae41190 100644
--- a/gpu/command_buffer/tests/gl_virtual_contexts_unittests.cc
+++ b/gpu/command_buffer/tests/gl_virtual_contexts_unittests.cc
@@ -48,6 +48,7 @@ class GLVirtualContextsTest : public testing::Test {
 
 namespace {
 
+#if !defined(OS_ANDROID)
 void SetupSimpleShader(const uint8* color) {
   static const char* v_shader_str = SHADER(
       attribute vec4 a_Position;
@@ -90,6 +91,8 @@ void TestDraw(int size) {
   glDrawArrays(GL_TRIANGLES, 0, 6);
 }
 
+#endif  // !defined(OS_ANDROID)
+
 }  // anonymous namespace
 
 // http://crbug.com/281565