Ensure GL initialization only happens once, and provide common init path

gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
index 5895c3e3d23eecf6db60f00b16d46cc3ba120e85..9b7ee5d2eecac2602a8e4d332147e2ffba182a7e 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
@@ -115,8 +115,7 @@ void GLES2DecoderTestBase::InitDecoderWithCommandLine(
     const CommandLine* command_line) {
   Framebuffer::ClearFramebufferCompleteComboMap();
 
-  gfx::ClearGLBindings();
-  gfx::InitializeStaticGLBindings(gfx::kGLImplementationMockGL);
+  gfx::GLSurface::InitializeOneOffWithMockBindingsForTests();
 
   gl_.reset(new StrictMock<MockGLInterface>());
   ::gfx::GLInterface::SetGLInterface(gl_.get());
@@ -292,7 +291,7 @@ void GLES2DecoderTestBase::InitDecoderWithCommandLine(
   context_->SetGLVersionString(gl_version);
 
   context_->MakeCurrent(surface_.get());
-  gfx::InitializeDynamicGLBindings(gfx::kGLImplementationMockGL, context_);
+  gfx::GLSurface::InitializeDynamicMockBindingsForTests(context_);
 
   int32 attributes[] = {
     EGL_ALPHA_SIZE, request_alpha ? 8 : 0,