Implement texel buffers

src/gpu/GrFragmentProcessor.cpp

Index: src/gpu/GrFragmentProcessor.cpp
diff --git a/src/gpu/GrFragmentProcessor.cpp b/src/gpu/GrFragmentProcessor.cpp
index 46efd8069071fa93e968cbc51f5187e2c0a6e2df..9524c84df1e0d881b2f94524194385bfc5edc07d 100644
--- a/src/gpu/GrFragmentProcessor.cpp
+++ b/src/gpu/GrFragmentProcessor.cpp
@@ -27,7 +27,7 @@ GrFragmentProcessor::~GrFragmentProcessor() {
 bool GrFragmentProcessor::isEqual(const GrFragmentProcessor& that,
                                   bool ignoreCoordTransforms) const {
     if (this->classID() != that.classID() ||
-        !this->hasSameTextureAccesses(that)) {
+        !this->hasSameSamplers(that)) {
         return false;
     }
     if (ignoreCoordTransforms) {
@@ -69,6 +69,15 @@ void GrFragmentProcessor::addTextureAccess(const GrTextureAccess* textureAccess)
     fNumTexturesExclChildren++;
 }
 
+void GrFragmentProcessor::addBufferAccess(const GrBufferAccess* bufferAccess) {
+    // Can't add buffer accesses after registering any children since their buffer accesses have
+    // already been bubbled up into our fBufferAccesses array
+    SkASSERT(fChildProcessors.empty());
+
+    INHERITED::addBufferAccess(bufferAccess);
+    fNumBuffersExclChildren++;
+}
+
 void GrFragmentProcessor::addCoordTransform(const GrCoordTransform* transform) {
     // Can't add transforms after registering any children since their transforms have already been
     // bubbled up into our fCoordTransforms array