Add Histogram Macros to Skia

src/gpu/SkGpuDevice.cpp

Index: src/gpu/SkGpuDevice.cpp
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 4fdd4aea8a4df2ff11167d60da1e635f7a3ec274..54fc63eeceaafaf0e58f0a858428f4efa402226e 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -23,6 +23,7 @@
 #include "SkGrTexturePixelRef.h"
 #include "SkGr.h"
 #include "SkGrPriv.h"
+#include "SkHistogramLogging.h"
 #include "SkImage_Base.h"
 #include "SkImageCacherator.h"
 #include "SkImageFilter.h"
@@ -934,6 +935,11 @@ void SkGpuDevice::drawTiledBitmap(const SkBitmap& bitmap,
                                   int tileSize,
                                   bool bicubic) {
     ASSERT_SINGLE_OWNER
+
+    // This is the funnel for all paths that draw tiled bitmaps/images. Log a
+    // histogram entry.
+    SK_HISTOGRAM_BOOLEAN("DrawTiled", true);
+
     // The following pixel lock is technically redundant, but it is desirable
     // to lock outside of the tile loop to prevent redecoding the whole image
     // at each tile in cases where 'bitmap' holds an SkDiscardablePixelRef that