ui: Allow individual test suites to opt-out of the TestCompositor.

ui/gl/gl_implementation.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_IMPLEMENTATION_H_
 #define UI_GL_GL_IMPLEMENTATION_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 38 matching lines @@
 GL_EXPORT bool InitializeDynamicGLBindings(GLImplementation implementation,
                                            GLContext* context);
 
 // Initialize Debug logging wrappers for GL bindings.
 void InitializeDebugGLBindings();
 
 // Initialize stub methods for drawing operations in the GL bindings. The
 // null draw bindings default to enabled, so that draw operations do nothing.
 void InitializeNullDrawGLBindings();
 
+// TODO(danakj): Remove this when all test suites are using null-draw.
+GL_EXPORT bool HasInitializedNullDrawGLBindings();
+
 // Once initialized, instantiating this turns the stub methods for drawing
 // operations off allowing drawing will occur while the object is alive.
 class GL_EXPORT DisableNullDrawGLBindings {
  public:
   DisableNullDrawGLBindings();
   ~DisableNullDrawGLBindings();
 
  private:
   bool initial_enabled_;
 };
@@ skipping 35 matching lines @@
 // unsupported.
 void* GetGLProcAddress(const char* name);
 
 // Return information about the GL window system binding implementation (e.g.,
 // EGL, GLX, WGL). Returns true if the information was retrieved successfully.
 GL_EXPORT bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info);
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_IMPLEMENTATION_H_