Implement texel buffers

src/gpu/gl/GrGLCaps.h

Index: src/gpu/gl/GrGLCaps.h
diff --git a/src/gpu/gl/GrGLCaps.h b/src/gpu/gl/GrGLCaps.h
index e2bc100cae8d6f02f188e43dfc93fd371a24a77c..1602a0f63d113935b2484de59a8778b9a4f9146f 100644
--- a/src/gpu/gl/GrGLCaps.h
+++ b/src/gpu/gl/GrGLCaps.h
@@ -135,11 +135,19 @@ public:
         return SkToBool(fConfigTable[config].fFlags & ConfigInfo::kCanUseTexStorage_Flag);
     }
 
+    bool canUseConfigWithTexelBuffer(GrPixelConfig config) const {
+        return SkToBool(fConfigTable[config].fFlags & ConfigInfo::kCanUseWithTexelBuffer_Flag);
+    }
+
     /** Returns the mapping between GrPixelConfig components and GL internal format components. */
     const GrSwizzle& configSwizzle(GrPixelConfig config) const {
         return fConfigTable[config].fSwizzle;
     }
 
+    GrGLenum configSizedInternalFormat(GrPixelConfig config) const {
+        return fConfigTable[config].fFormats.fSizedInternalFormat;
+    }
+
     bool getTexImageFormats(GrPixelConfig surfaceConfig, GrPixelConfig externalConfig,
                             GrGLenum* internalFormat, GrGLenum* externalFormat,
                             GrGLenum* externalType) const;
@@ -468,6 +476,7 @@ private:
             kRenderable_Flag              = 0x4,
             kRenderableWithMSAA_Flag      = 0x8,
             kCanUseTexStorage_Flag        = 0x10,
+            kCanUseWithTexelBuffer_Flag   = 0x20,
         };
         uint32_t fFlags;