Implement highQualityFilter16 so GM doesn't crash when you give it resources.

src/core/SkBitmapProcState.h

Index: src/core/SkBitmapProcState.h
diff --git a/src/core/SkBitmapProcState.h b/src/core/SkBitmapProcState.h
index e138ed269864c3c5b0453593514b1ec6b6daa877..3a1d7bad620c4b9f241ad42d801b32c1b56d6a64 100644
--- a/src/core/SkBitmapProcState.h
+++ b/src/core/SkBitmapProcState.h
@@ -166,7 +166,9 @@ private:
 
     SkBitmapFilter* fBitmapFilter;
 
-    ShaderProc32 chooseBitmapFilterProc();
+    // If supported, sets fShaderProc32 and fShaderProc16 and returns true,
+    // otherwise returns false.
+    bool setBitmapFilterProcs();
 
     // Return false if we failed to setup for fast translate (e.g. overflow)
     bool setupForTranslate();
@@ -208,9 +210,9 @@ void S32_opaque_D32_filter_DX(const SkBitmapProcState& s, const uint32_t xy[],
 void S32_alpha_D32_filter_DX(const SkBitmapProcState& s, const uint32_t xy[],
                              int count, SkPMColor colors[]);
 void S32_opaque_D32_filter_DXDY(const SkBitmapProcState& s,
-                           const uint32_t xy[], int count, SkPMColor colors[]);
+                                const uint32_t xy[], int count, SkPMColor colors[]);
 void S32_alpha_D32_filter_DXDY(const SkBitmapProcState& s,
-                           const uint32_t xy[], int count, SkPMColor colors[]);
+                               const uint32_t xy[], int count, SkPMColor colors[]);
 void ClampX_ClampY_filter_scale(const SkBitmapProcState& s, uint32_t xy[],
                                 int count, int x, int y);
 void ClampX_ClampY_nofilter_scale(const SkBitmapProcState& s, uint32_t xy[],
@@ -220,10 +222,12 @@ void ClampX_ClampY_filter_affine(const SkBitmapProcState& s,
 void ClampX_ClampY_nofilter_affine(const SkBitmapProcState& s,
                                    uint32_t xy[], int count, int x, int y);
 void S32_D16_filter_DX(const SkBitmapProcState& s,
-                                   const uint32_t* xy, int count, uint16_t* colors);
+                       const uint32_t* xy, int count, uint16_t* colors);
 
-void highQualityFilter(const SkBitmapProcState &s, int x, int y,
-                   SkPMColor *SK_RESTRICT colors, int count);
+void highQualityFilter32(const SkBitmapProcState &s, int x, int y,
+                         SkPMColor *SK_RESTRICT colors, int count);
+void highQualityFilter16(const SkBitmapProcState &s, int x, int y,
+                         uint16_t *SK_RESTRICT colors, int count);
 
 
 #endif