Allow -DGOOGLE3 to bypass our normal platform intrinsic dispatch.

include/core/SkThread.h

Index: include/core/SkThread.h
diff --git a/include/core/SkThread.h b/include/core/SkThread.h
index bcbc43754f69e986eaadfbb3195bfbbff8fef7a6..fffe787e71473029b86a2544b6d9397ebb8cc626 100644
--- a/include/core/SkThread.h
+++ b/include/core/SkThread.h
@@ -44,7 +44,11 @@ static void sk_membar_acquire__after_atomic_dec();
  */
 static void sk_membar_acquire__after_atomic_conditional_inc();
 
-#include SK_ATOMICS_PLATFORM_H
+#ifdef GOOGLE3
+    #include "SkAtomics_sync.h"
+#else
+    #include SK_ATOMICS_PLATFORM_H
+#endif
 
 /** Atomically adds one to the int referenced by addr iff the referenced int was not 0
  *  and returns the previous value.
@@ -78,7 +82,11 @@ template <typename T> T sk_acquire_load(T*);
  */
 template <typename T> void sk_release_store(T*, T);
 
-#include SK_BARRIERS_PLATFORM_H
+#ifdef GOOGLE3
+    #include "SkBarriers_x86.h"
+#else
+    #include SK_BARRIERS_PLATFORM_H
+#endif
 
 /** SK_MUTEX_PLATFORM_H must provide the following (or equivalent) declarations.
 
@@ -98,7 +106,11 @@ public:
 #define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name = ...
 */
 
-#include SK_MUTEX_PLATFORM_H
+#ifdef GOOGLE3
+    #include "SkMutex_pthread.h"
+#else
+    #include SK_MUTEX_PLATFORM_H
+#endif
 
 
 class SkAutoMutexAcquire : SkNoncopyable {