add new copyTo version to SkBitmap, which takes SkColorType

samplecode/SampleFilter.cpp

Index: samplecode/SampleFilter.cpp
diff --git a/samplecode/SampleFilter.cpp b/samplecode/SampleFilter.cpp
index 1b26bf246341bf66f6975f834ca60883bffdd152..7b2c5516a2aee90783f6f71b9307b8001a2dc41d 100644
--- a/samplecode/SampleFilter.cpp
+++ b/samplecode/SampleFilter.cpp
@@ -89,9 +89,9 @@ public:
 
     FilterView() {
         make_bm(&fBM8);
-        fBM8.copyTo(&fBM4444, SkBitmap::kARGB_4444_Config);
-        fBM8.copyTo(&fBM16, SkBitmap::kRGB_565_Config);
-        fBM8.copyTo(&fBM32, SkBitmap::kARGB_8888_Config);
+        fBM8.copyTo(&fBM4444, kARGB_4444_SkColorType);
+        fBM8.copyTo(&fBM16, kRGB_565_SkColorType);
+        fBM8.copyTo(&fBM32, kPMColor_SkColorType);
 
         this->setBGColor(0xFFDDDDDD);
     }