Add an Android-framework-only stable ID to SkPixelRef.

src/core/SkPixelRef.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPixelRef.h"
 #include "SkThread.h"
 
@@ skipping 185 matching lines @@
 }
 
 uint32_t SkPixelRef::getGenerationID() const {
     if (0 == fGenerationID) {
         fGenerationID = SkNextPixelRefGenerationID();
         fUniqueGenerationID = true;  // The only time we can be sure of this!
     }
     return fGenerationID;
 }
 
+#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
+uint32_t SkPixelRef::getStableID() const {
+    if (0 == fStableID) {
+        // Although it is okay for the stable ID to collide with a gen ID, it
+        // is also okay for them not to collide, and this allows us to share
+        // code.
+        fStableID = SkNextPixelRefGenerationID();
+    }
+    return fStableID;
+}
+#endif
+
 void SkPixelRef::addGenIDChangeListener(GenIDChangeListener* listener) {
     if (NULL == listener || !fUniqueGenerationID) {
         // No point in tracking this if we're not going to call it.
         SkDELETE(listener);
         return;
     }
     *fGenIDChangeListeners.append() = listener;
 }
 
 void SkPixelRef::callGenIDChangeListeners() {
@@ skipping 50 matching lines @@
 
 #ifdef SK_BUILD_FOR_ANDROID
 void SkPixelRef::globalRef(void* data) {
     this->ref();
 }
 
 void SkPixelRef::globalUnref() {
     this->unref();
 }
 #endif