add kMultiply_Mode to switch statement (fix warning)

git-svn-id: http://skia.googlecode.com/svn/trunk@7556 2bbb7eff-a529-9590-31e7-b0007b416f81

src/pdf/SkPDFGraphicState.cpp

@@ -1,4 +1,3 @@
-
 /*
  * Copyright 2011 Google Inc.
  *
@@ -6,7 +5,6 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkPDFFormXObject.h"
 #include "SkPDFGraphicState.h"
 #include "SkPDFUtils.h"
@@ -44,6 +42,7 @@ static const char* blend_mode_from_xfermode(SkXfermode::Mode mode) {
         case SkXfermode::kDstATop_Mode:
         case SkXfermode::kXor_Mode:
         case SkXfermode::kPlus_Mode:
+        case SkXfermode::kMultiply_Mode:
             return NULL;
     }
     return NULL;