Avoid regenerating cached textblobs on integer scrolls

src/gpu/GrDrawTarget.h

Index: src/gpu/GrDrawTarget.h
diff --git a/src/gpu/GrDrawTarget.h b/src/gpu/GrDrawTarget.h
index 072b72702a39b7bd2b3a64e190744b9ef185a433..8a12a31ea9f1d884ac593a5b642d4ba3370d5508 100644
--- a/src/gpu/GrDrawTarget.h
+++ b/src/gpu/GrDrawTarget.h
@@ -11,7 +11,6 @@
 #include "GrClip.h"
 #include "GrClipMaskManager.h"
 #include "GrContext.h"
-#include "GrMemoryPool.h"
 #include "GrPathProcessor.h"
 #include "GrPrimitiveProcessor.h"
 #include "GrIndexBuffer.h"
@@ -574,9 +573,6 @@ public:
     virtual void setDrawBuffers(DrawInfo*, size_t vertexStride) = 0;;
     bool programUnitTest(int maxStages);
 
-    // TODO I should make the bitmapTextBlob cache a thing, which lives on draw target
-    GrMemoryPool* pool() { return &fPool; }
-
 protected:
     friend class GrTargetCommands; // for PipelineInfo
 
@@ -811,7 +807,6 @@ private:
     int                                                             fGpuTraceMarkerCount;
     GrTraceMarkerSet                                                fActiveTraceMarkers;
     GrTraceMarkerSet                                                fStoredTraceMarkers;
-    GrMemoryPool                                                    fPool;
 
     typedef SkRefCnt INHERITED;
 };