Don't crash when an image fails to decode.

Source/platform/graphics/BitmapImageTest.cpp

Index: Source/platform/graphics/BitmapImageTest.cpp
diff --git a/Source/platform/graphics/BitmapImageTest.cpp b/Source/platform/graphics/BitmapImageTest.cpp
index f81655536d7146fcca223efddd92327ad916715b..57d32f0461835474ca51601183db55ddbf2db67e 100644
--- a/Source/platform/graphics/BitmapImageTest.cpp
+++ b/Source/platform/graphics/BitmapImageTest.cpp
@@ -106,6 +106,11 @@ public:
         m_image->advanceAnimation(0);
     }
 
+    PassRefPtr<Image> imageForDefaultFrame()
+    {
+        return m_image->imageForDefaultFrame();
+    }
+
 protected:
     virtual void SetUp() OVERRIDE
     {
@@ -230,6 +235,13 @@ TEST_F(BitmapImageTest, webpHasColorProfile)
     EXPECT_FALSE(m_image->hasColorProfile());
 }
 
+TEST_F(BitmapImageTest, icoHasWrongFrameDimensions)
+{
+    loadImage("/LayoutTests/fast/images/resources/wrong-frame-dimensions.ico");
+    // This call would cause crash without fix for 408026
+    imageForDefaultFrame();
+}
+
 #endif // USE(QCMSLIB)
 
 } // namespace blink