gpu: Workaround Adreno 420 bug with deleting current FBO.

gpu/command_buffer/service/framebuffer_manager.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 GPU_COMMAND_BUFFER_SERVICE_FRAMEBUFFER_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_FRAMEBUFFER_MANAGER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 56 matching lines @@
 
   bool HasUnclearedAttachment(GLenum attachment) const;
   bool HasUnclearedColorAttachments() const;
 
   void MarkAttachmentAsCleared(
     RenderbufferManager* renderbuffer_manager,
     TextureManager* texture_manager,
     GLenum attachment,
     bool cleared);
 
+  // Unbinds all attachments from this framebuffer.  The framebuffer must be
+  // bound when calling this.
+  void UnbindAttachments(GLenum target);

[no sievers, 2015/02/17 22:49:54]

Can you rename it to something so that it doesn't accidentally get used in the
wrong way, and since it leaves the object in an inconsistent state (compared
with UnbindRenderbuffer/Texture for example)?

DoUnbindGLAttachmentsForWorkaround() or something :)

[vmiura, 2015/02/18 17:43:18]

Done.

+
   // Attaches a renderbuffer to a particlar attachment.
   // Pass null to detach.
   void AttachRenderbuffer(
       GLenum attachment, Renderbuffer* renderbuffer);
 
   // Attaches a texture to a particlar attachment. Pass null to detach.
   void AttachTexture(
       GLenum attachment, TextureRef* texture_ref, GLenum target,
       GLint level, GLsizei samples);
 
@@ skipping 222 matching lines @@
   typedef std::vector<TextureDetachObserver*> TextureDetachObserverVector;
   TextureDetachObserverVector texture_detach_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(FramebufferManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_FRAMEBUFFER_MANAGER_H_