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

cc/test/layer_tree_pixel_test.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/test/layer_tree_pixel_test.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "cc/base/switches.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/layers/texture_layer.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/resources/texture_mailbox.h"
 #include "cc/test/paths.h"
 #include "cc/test/pixel_comparator.h"
 #include "cc/test/pixel_test_output_surface.h"
 #include "cc/test/pixel_test_software_output_device.h"
 #include "cc/test/pixel_test_utils.h"
 #include "cc/test/test_in_process_context_provider.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "gpu/command_buffer/client/gl_in_process_context.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
-#include "ui/gl/gl_implementation.h"
 
 using gpu::gles2::GLES2Interface;
 
 namespace cc {
 
 LayerTreePixelTest::LayerTreePixelTest()
     : pixel_comparator_(new ExactPixelComparator(true)),
       test_type_(GL_WITH_DEFAULT),
       pending_texture_mailbox_callbacks_(0),
       impl_side_painting_(true) {}
@@ skipping 13 matching lines @@
       software_output_device->set_surface_expansion_size(
           surface_expansion_size);
       output_surface = make_scoped_ptr(
           new PixelTestOutputSurface(
               software_output_device.PassAs<SoftwareOutputDevice>()));
       break;
     }
 
     case GL_WITH_DEFAULT:
     case GL_WITH_BITMAP: {
-      CHECK(gfx::InitializeStaticGLBindings(gfx::kGLImplementationOSMesaGL));
-
       output_surface = make_scoped_ptr(
           new PixelTestOutputSurface(new TestInProcessContextProvider));
       break;
     }
   }
 
   output_surface->set_surface_expansion_size(surface_expansion_size);
   return output_surface.PassAs<OutputSurface>();
 }
 
@@ skipping 239 matching lines @@
   TryEndTest();
 }
 
 void LayerTreePixelTest::CopyBitmapToTextureMailboxAsTexture(
     const SkBitmap& bitmap,
     TextureMailbox* texture_mailbox,
     scoped_ptr<SingleReleaseCallback>* release_callback) {
   DCHECK_GT(bitmap.width(), 0);
   DCHECK_GT(bitmap.height(), 0);
 
-  CHECK(gfx::InitializeStaticGLBindings(gfx::kGLImplementationOSMesaGL));
-
   scoped_ptr<gpu::GLInProcessContext> context = CreateTestInProcessContext();
   GLES2Interface* gl = context->GetImplementation();
 
   GLuint texture_id = 0;
   gl->GenTextures(1, &texture_id);
   gl->BindTexture(GL_TEXTURE_2D, texture_id);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
@@ skipping 40 matching lines @@
 
   *texture_mailbox = TextureMailbox(mailbox, sync_point);
   *release_callback = SingleReleaseCallback::Create(
       base::Bind(&LayerTreePixelTest::ReleaseTextureMailbox,
                  base::Unretained(this),
                  base::Passed(&context),
                  texture_id));
 }
 
 }  // namespace cc