change default impl to facilitate transition in blink/chrome

src/core/SkImageGenerator.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageGenerator.h"
 
 #ifdef SK_SUPPORT_LEGACY_BOOL_ONGETINFO
@@ skipping 105 matching lines @@
     return this->onGetYUV8Planes(sizes, planes, rowBytes);
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////////
 
 SkData* SkImageGenerator::onRefEncodedData() {
     return NULL;
 }
 
 #ifdef SK_SUPPORT_LEGACY_BOOL_ONGETINFO
-bool SkImageGenerator::onGetInfo(SkImageInfo*) {
-    return false;
+bool SkImageGenerator::onGetInfo(SkImageInfo* info) {
+    if (info) {
+        *info = fInfo;
+    }
+    return true;
 }
 #endif
 
 #ifdef SK_SUPPORT_LEGACY_OPTIONLESS_GET_PIXELS
 SkImageGenerator::Result SkImageGenerator::onGetPixels(const SkImageInfo&, void*, size_t,
                                                        SkPMColor*, int*) {
     return kUnimplemented;
 }
 #endif
 
 SkImageGenerator::Result SkImageGenerator::onGetPixels(const SkImageInfo& info, void* dst,
                                                        size_t rb, const Options& options,
                                                        SkPMColor* colors, int* colorCount) {
 #ifdef SK_SUPPORT_LEGACY_OPTIONLESS_GET_PIXELS
     return this->onGetPixels(info, dst, rb, colors, colorCount);
 #else
     return kUnimplemented;
 #endif
 }