resize canvas for GM + typo

This change resized the canvas for some GM cases. It is better to show the visual difference in viewer.html for these cases after the CL applied.

BUG=skia:2375
R=reed@google.com, djsollen@google.com

Author: yunchao.he@intel.com

Review URL: https://codereview.chromium.org/221953002

git-svn-id: http://skia.googlecode.com/svn/trunk@14177 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/peekpixels.cpp b/gm/peekpixels.cpp
index bf9c8fa..484e4e0 100644
--- a/gm/peekpixels.cpp
+++ b/gm/peekpixels.cpp
@@ -29,7 +29,7 @@
     }
 
     virtual SkISize onISize() SK_OVERRIDE {
-        return SkISize::Make(640, 480);
+        return SkISize::Make(360, 120);
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {