Improve tracking of bound FBOs in GrGLGpu.

src/gpu/gl/GrGLCaps.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrGLCaps_DEFINED
 #define GrGLCaps_DEFINED
@@ skipping 249 matching lines @@
                              GrGLenum format,
                              GrGLenum type,
                              GrGLenum currFboFormat) const;
 
     bool isCoreProfile() const { return fIsCoreProfile; }
 
 
     bool fullClearIsFree() const { return fFullClearIsFree; }
 
     bool dropsTileOnZeroDivide() const { return fDropsTileOnZeroDivide; }
+    
+    bool preferBindingToReadAndDrawFramebuffer() const {
+        return fPreferBindingToReadAndDrawFramebuffer;
+    }
 
     /**
      * Returns a string containing the caps info.
      */
     SkString dump() const SK_OVERRIDE;
 
     /**
      * LATC can appear under one of three possible names. In order to know
      * which GL internal format to use, we need to keep track of which name
      * we found LATC under. The default is LATC.
@@ skipping 102 matching lines @@
     bool fTwoFormatLimit : 1;
     bool fFragCoordsConventionSupport : 1;
     bool fVertexArrayObjectSupport : 1;
     bool fES2CompatibilitySupport : 1;
     bool fUseNonVBOVertexAndIndexDynamicData : 1;
     bool fIsCoreProfile : 1;
     bool fFullClearIsFree : 1;
     bool fDropsTileOnZeroDivide : 1;
     bool fFBFetchSupport : 1;
     bool fFBFetchNeedsCustomOutput : 1;
+    bool fPreferBindingToReadAndDrawFramebuffer : 1;
 
     const char* fFBFetchColorName;
     const char* fFBFetchExtensionString;
 
     struct ReadPixelsSupportedFormat {
         GrGLenum fFormat;
         GrGLenum fType;
         GrGLenum fFboFormat;
 
         bool operator==(const ReadPixelsSupportedFormat& rhs) const {
             return fFormat    == rhs.fFormat
                 && fType      == rhs.fType
                 && fFboFormat == rhs.fFboFormat;
         }
         static uint32_t Hash(const ReadPixelsSupportedFormat& r) {
             return SkChecksum::Murmur3(reinterpret_cast<const uint32_t*>(&r), sizeof(r));
         }
     };
 
     mutable SkTHashMap<ReadPixelsSupportedFormat, bool, ReadPixelsSupportedFormat::Hash>
         fReadPixelsSupportedCache;
 
     typedef GrDrawTargetCaps INHERITED;
 };
 
 #endif