Revert "Revert of Use the GrCacheable ID to eliminate the need for notifications to GrGpuGL when te…

src/gpu/GrCacheable.cpp

Index: src/gpu/GrCacheable.cpp
diff --git a/src/gpu/GrCacheable.cpp b/src/gpu/GrCacheable.cpp
index 120be78f0802c69bc26f32d10e038405e656709c..5dc52581173075b9003e139530f536eea9736342 100644
--- a/src/gpu/GrCacheable.cpp
+++ b/src/gpu/GrCacheable.cpp
@@ -8,10 +8,11 @@
 
 #include "GrCacheable.h"
 
-uint32_t GrCacheable::getGenerationID() const {
-    static int32_t gPathRefGenerationID;
-    while (!fGenID) {
-        fGenID = static_cast<uint32_t>(sk_atomic_inc(&gPathRefGenerationID) + 1);
-    }
-    return fGenID;
+uint32_t GrCacheable::CreateUniqueID() {
+    static int32_t gCacheableID = SK_InvalidUniqueID;
+    uint32_t id;
+    do {
+        id = static_cast<uint32_t>(sk_atomic_inc(&gCacheableID) + 1);
+    } while (id == SK_InvalidUniqueID);
+    return id;
 }