Properly resize paletted bitmaps when adjusting for density

If an app used a GIF file in the wrong density bucket, the auto-scaling
code would not properly resize the bitmap.

This issue affects third party applications, here is the external bug
report:

http://code.google.com/p/android/issues/detail?id=34619

DO NOT MERGE

Change-Id: I7f99b28ad6e6c28bdbcb29bbbadcb215268ff710

Author: Romain Guy

core/jni/android/graphics/BitmapFactory.cpp

@@ -327,7 +327,18 @@ static jobject doDecode(JNIEnv* env, SkStream* stream, jobject padding,
         const float sx = scaledWidth / float(decoded->width());
         const float sy = scaledHeight / float(decoded->height());
 
-        bitmap->setConfig(decoded->getConfig(), scaledWidth, scaledHeight);
+        SkBitmap::Config config = decoded->config();
+        switch (config) {
+            case SkBitmap::kNo_Config:
+            case SkBitmap::kIndex8_Config:
+            case SkBitmap::kRLE_Index8_Config:
+                config = SkBitmap::kARGB_8888_Config;
+                break;
+            default:
+                break;
+        }
+
+        bitmap->setConfig(config, scaledWidth, scaledHeight);
         bitmap->setIsOpaque(decoded->isOpaque());
         bitmap->allocPixels(&javaAllocator, NULL);
         bitmap->eraseColor(0);