gpu: Bind dummy GL API when no context is current

ui/gl/gl_context_egl.cc

 // 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.
 
 #include "ui/gl/gl_context_egl.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
@@ skipping 75 matching lines @@
 
     context_ = NULL;
   }
 }
 
 bool GLContextEGL::MakeCurrent(GLSurface* surface) {
   DCHECK(context_);
   if (IsCurrent(surface))
       return true;
 
+  ScopedReleaseCurrent release_current;
   TRACE_EVENT2("gpu", "GLContextEGL::MakeCurrent",
                "context", context_,
                "surface", surface);
 
   if (unbind_fbo_on_makecurrent_ &&
       eglGetCurrentContext() != EGL_NO_CONTEXT) {
     glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
   }
 
   if (!eglMakeCurrent(display_,
                       surface->GetHandle(),
                       surface->GetHandle(),
                       context_)) {
     DVLOG(1) << "eglMakeCurrent failed with error "
              << GetLastEGLErrorString();
     return false;
   }
 
   // Set this as soon as the context is current, since we might call into GL.
   SetRealGLApi();
 
   SetCurrent(surface);
   if (!InitializeDynamicBindings()) {
-    ReleaseCurrent(surface);
     return false;
   }
 
   if (!surface->OnMakeCurrent(this)) {
     LOG(ERROR) << "Could not make current.";
     return false;
   }
 
+  release_current.Cancel();
   return true;
 }
 
 void GLContextEGL::SetUnbindFboOnMakeCurrent() {
   unbind_fbo_on_makecurrent_ = true;
 }
 
 void GLContextEGL::ReleaseCurrent(GLSurface* surface) {
   if (!IsCurrent(surface))
     return;
@@ skipping 60 matching lines @@
 
 #if !defined(OS_ANDROID)
 bool GLContextEGL::GetTotalGpuMemory(size_t* bytes) {
   DCHECK(bytes);
   *bytes = 0;
   return false;
 }
 #endif
 
 }  // namespace gfx