Small change to move GrProcessor and GrBatch pools over to SkSpinlock

src/gpu/GrProcessor.cpp

Index: src/gpu/GrProcessor.cpp
diff --git a/src/gpu/GrProcessor.cpp b/src/gpu/GrProcessor.cpp
index 3b8cb679fd47b887897be5bb27262c5c9d935dbe..a8d1fdd5d7f610db31eed1b213bb104507ca608d 100644
--- a/src/gpu/GrProcessor.cpp
+++ b/src/gpu/GrProcessor.cpp
@@ -12,7 +12,7 @@
 #include "GrInvariantOutput.h"
 #include "GrMemoryPool.h"
 #include "GrXferProcessor.h"
-#include "SkMutex.h"
+#include "SkSpinlock.h"
 
 #if SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
 
@@ -102,12 +102,12 @@ const SkMatrix& TestMatrix(SkRandom* random) {
 // barrier between accesses of a context on different threads. Also, there may be multiple
 // GrContexts and those contexts may be in use concurrently on different threads.
 namespace {
-SK_DECLARE_STATIC_MUTEX(gProcessorPoolMutex);
+static SkSpinlock gProcessorSpinlock;
 class MemoryPoolAccessor {
 public:
-    MemoryPoolAccessor() { gProcessorPoolMutex.acquire(); }
+    MemoryPoolAccessor() { gProcessorSpinlock.acquire(); }
 
-    ~MemoryPoolAccessor() { gProcessorPoolMutex.release(); }
+    ~MemoryPoolAccessor() { gProcessorSpinlock.release(); }
 
     GrMemoryPool* pool() const {
         static GrMemoryPool gPool(4096, 4096);