Fix premultiplied alpha.

Change-Id: I08da422c5350503e1f4f27b9890f15a813d0c6c7
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index a52489f..94bf0c3 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -179,7 +179,7 @@
      * @param isPremultiplied Indicates whether the texture has premultiplied alpha
      */
     void drawTextureRect(float left, float top, float right, float bottom, GLuint texture,
-            float alpha, SkXfermode::Mode mode, bool blend, bool isPremultiplied = false);
+            float alpha, SkXfermode::Mode mode, bool blend, bool isPremultiplied = true);
 
     /**
      * Draws a textured rectangle with the specified texture. The specified coordinates
@@ -194,7 +194,7 @@
      * @param isPremultiplied Indicates whether the texture has premultiplied alpha
      */
     void drawTextureRect(float left, float top, float right, float bottom, const Texture* texture,
-            const SkPaint* paint, bool isPremultiplied = false);
+            const SkPaint* paint, bool isPremultiplied = true);
 
     /**
      * Draws a textured mesh with the specified texture. If the indices are omitted, the