Add an option to create unpremultiplied bitmaps.

src/ports/SkImageDecoder_WIC.cpp

Index: src/ports/SkImageDecoder_WIC.cpp
diff --git a/src/ports/SkImageDecoder_WIC.cpp b/src/ports/SkImageDecoder_WIC.cpp
index cd7f29fae480c4a3d6ba28765aec68608dfc10c9..de88b410d533a95ddc80f891e0d236846f6abbb4 100644
--- a/src/ports/SkImageDecoder_WIC.cpp
+++ b/src/ports/SkImageDecoder_WIC.cpp
@@ -166,9 +166,19 @@ bool SkImageDecoder_WIC::decodeStream(SkStream* stream, SkBitmap* bm, WICModes w
         hr = piBitmapSourceOriginal->GetSize(&width, &height);
     }
 
+    bool premul;
+    GUID destinationPixelFormat;
+    if (this->getRequestUnpremultipliedColors()) {
+        premul = false;
+        destinationPixelFormat = GUID_WICPixelFormat32bppBGRA;
+    } else {
+        premul = true;
+        destinationPixelFormat = GUID_WICPixelFormat32bppPBGRA;
+    }
+
     //Exit early if we're only looking for the bitmap bounds.
     if (SUCCEEDED(hr)) {
-        bm->setConfig(SkBitmap::kARGB_8888_Config, width, height);
+        bm->setConfig(SkBitmap::kARGB_8888_Config, width, height, 0, premul);
         if (kDecodeBounds_WICMode == wicMode) {
             return true;
         }
@@ -186,7 +196,7 @@ bool SkImageDecoder_WIC::decodeStream(SkStream* stream, SkBitmap* bm, WICModes w
     if (SUCCEEDED(hr)) {
         hr = piFormatConverter->Initialize(
             piBitmapSourceOriginal.get()      //Input bitmap to convert
-            , GUID_WICPixelFormat32bppPBGRA   //Destination pixel format
+            , destinationPixelFormat          //Destination pixel format
             , WICBitmapDitherTypeNone         //Specified dither patterm
             , NULL                            //Specify a particular palette
             , 0.f                             //Alpha threshold