Create SkBitmapChecksummer and associated SkBitmapTransformer

As needed to start capturing gm image checksums.
Review URL: https://codereview.appspot.com/6920050

git-svn-id: http://skia.googlecode.com/svn/trunk@6759 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/tests.gyp b/gyp/tests.gyp
index 3353d9a..066435c 100644
--- a/gyp/tests.gyp
+++ b/gyp/tests.gyp
@@ -23,6 +23,7 @@
         '../tests/BitmapFactoryTest.cpp',
         '../tests/BitmapGetColorTest.cpp',
         '../tests/BitmapHeapTest.cpp',
+        '../tests/BitmapTransformerTest.cpp',
         '../tests/BitSetTest.cpp',
         '../tests/BlitRowTest.cpp',
         '../tests/BlurTest.cpp',
diff --git a/gyp/utils.gyp b/gyp/utils.gyp
index bea2d09..4e3f6d4 100644
--- a/gyp/utils.gyp
+++ b/gyp/utils.gyp
@@ -53,6 +53,10 @@
 
         '../src/utils/SkBase64.cpp',
         '../src/utils/SkBase64.h',
+        '../src/utils/SkBitmapChecksummer.cpp',
+        '../src/utils/SkBitmapChecksummer.h',
+        '../src/utils/SkBitmapTransformer.cpp',
+        '../src/utils/SkBitmapTransformer.h',
         '../src/utils/SkBitSet.cpp',
         '../src/utils/SkBitSet.h',
         '../src/utils/SkBoundaryPatch.cpp',