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

src/core/SkPixelRef.cpp

Index: src/core/SkPixelRef.cpp
diff --git a/src/core/SkPixelRef.cpp b/src/core/SkPixelRef.cpp
index 0aa00e0bf58062fee2d3ddd7e706b81c18a44b0c..a2c37c6e72f92de7ce16d301632dacdb6dbb1fbf 100644
--- a/src/core/SkPixelRef.cpp
+++ b/src/core/SkPixelRef.cpp
@@ -87,7 +87,13 @@ static SkImageInfo validate_info(const SkImageInfo& info) {
     return info.makeAlphaType(newAlphaType);
 }
 
-SkPixelRef::SkPixelRef(const SkImageInfo& info) : fInfo(validate_info(info)) {
+SkPixelRef::SkPixelRef(const SkImageInfo& info)
+    : fInfo(validate_info(info))
+#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
+    , fStableID(SkNextPixelRefGenerationID())
+#endif
+
+{
     this->setMutex(NULL);
     fRec.zero();
     fLockCount = 0;
@@ -97,7 +103,12 @@ SkPixelRef::SkPixelRef(const SkImageInfo& info) : fInfo(validate_info(info)) {
 }
 
 
-SkPixelRef::SkPixelRef(const SkImageInfo& info, SkBaseMutex* mutex) : fInfo(validate_info(info)) {
+SkPixelRef::SkPixelRef(const SkImageInfo& info, SkBaseMutex* mutex)
+    : fInfo(validate_info(info))
+#ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
+    , fStableID(SkNextPixelRefGenerationID())
+#endif
+{
     this->setMutex(mutex);
     fRec.zero();
     fLockCount = 0;