Add support for GL_*_shader_framebuffer_fetch

src/gpu/GrDrawTargetCaps.h

Index: src/gpu/GrDrawTargetCaps.h
===================================================================
--- src/gpu/GrDrawTargetCaps.h	(revision 8966)
+++ src/gpu/GrDrawTargetCaps.h	(working copy)
@@ -35,6 +35,7 @@
     bool dualSourceBlendingSupport() const { return fDualSourceBlendingSupport; }
     bool bufferLockSupport() const { return fBufferLockSupport; }
     bool pathStencilingSupport() const { return fPathStencilingSupport; }
+    bool dstReadInShaderSupport() const { return fDstReadInShaderSupport; }
 
     int maxRenderTargetSize() const { return fMaxRenderTargetSize; }
     int maxTextureSize() const { return fMaxTextureSize; }
@@ -52,6 +53,7 @@
     bool fDualSourceBlendingSupport : 1;
     bool fBufferLockSupport         : 1;
     bool fPathStencilingSupport     : 1;
+    bool fDstReadInShaderSupport    : 1;
 
     int fMaxRenderTargetSize;
     int fMaxTextureSize;