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

ui/gl/gl_surface.h

 // 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.
 
 #ifndef UI_GL_GL_SURFACE_H_
 #define UI_GL_GL_SURFACE_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "build/build_config.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
 #include "ui/gl/gl_export.h"
+#include "ui/gl/gl_implementation.h"
 
 namespace gfx {
 
 class GLContext;
 class VSyncProvider;
 
 // Encapsulates a surface that can be rendered to with GL, hiding platform
 // specific management.
 class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
  public:
@@ skipping 37 matching lines @@
 
   bool HasExtension(const char* name);
 
   // Returns the internal frame buffer object name if the surface is backed by
   // FBO. Otherwise returns 0.
   virtual unsigned int GetBackingFrameBufferObject();
 
   // Copy part of the backbuffer to the frontbuffer.
   virtual bool PostSubBuffer(int x, int y, int width, int height);
 
+  // Initialize GL bindings.
   static bool InitializeOneOff();
 
+  // Unit tests should call these instead of InitializeOneOff() to set up
+  // GL bindings appropriate for tests.
+  static void InitializeOneOffForTests();
+  static void InitializeOneOffWithMockBindingsForTests();
+  static void InitializeDynamicMockBindingsForTests(GLContext* context);
+
   // Called after a context is made current with this surface. Returns false
   // on error.
   virtual bool OnMakeCurrent(GLContext* context);
 
   // Used for explicit buffer management.
   virtual bool SetBackbufferAllocation(bool allocated);
   virtual void SetFrontbufferAllocation(bool allocated);
 
   // Get a handle used to share the surface with another process. Returns null
   // if this is not possible.
@@ skipping 18 matching lines @@
       gfx::AcceleratedWidget window);
 
   // Create a GL surface used for offscreen rendering.
   static scoped_refptr<GLSurface> CreateOffscreenGLSurface(
       const gfx::Size& size);
 
   static GLSurface* GetCurrent();
 
  protected:
   virtual ~GLSurface();
+  static bool InitializeOneOffImplementation(GLImplementation impl,
+                                             bool fallback_to_osmesa,
+                                             bool gpu_service_logging,
+                                             bool disable_gl_drawing);
   static bool InitializeOneOffInternal();
   static void SetCurrent(GLSurface* surface);
 
   static bool ExtensionsContain(const char* extensions, const char* name);
 
  private:
   friend class base::RefCounted<GLSurface>;
   friend class GLContext;
 
   DISALLOW_COPY_AND_ASSIGN(GLSurface);
@@ skipping 33 matching lines @@
 
  private:
   scoped_refptr<GLSurface> surface_;
 
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceAdapter);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_SURFACE_H_