Link webp in skimage and debugger.

Review URL: https://codereview.chromium.org/14103020

git-svn-id: http://skia.googlecode.com/svn/trunk@8691 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/skimage_main.cpp b/tools/skimage_main.cpp
index b486d5d..af9b4ad 100644
--- a/tools/skimage_main.cpp
+++ b/tools/skimage_main.cpp
@@ -164,6 +164,8 @@
     // decoders.
     SkDEBUGCODE(SkImageDecoder *creator = ) CreateJPEGImageDecoder();
     SkASSERT(creator);
+    SkDEBUGCODE(creator = ) CreateWEBPImageDecoder();
+    SkASSERT(creator);
 #ifdef SK_BUILD_FOR_UNIX
     SkDEBUGCODE(creator = ) CreateGIFImageDecoder();
     SkASSERT(creator);