Add a test for a multipart image as cache

third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp

Index: third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp
diff --git a/third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp b/third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp
index daf35bd190b5dc7fb3e7d2aa8af05bc32d68e32f..1930c248b316b41e24964fc9f7a840689f75ac2a 100644
--- a/third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp
+++ b/third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp
@@ -245,6 +245,13 @@ TEST(ImageResourceTest, MultipartImage)
     ASSERT_EQ(cachedImage->getImage()->height(), 1);
     ASSERT_EQ(client->imageChangedCount(), 1);
     ASSERT_TRUE(client->notifyFinishedCalled());
+
+    // When the multipart image is retrieved from the cache, the image is empty.
+    cachedImage = ImageResource::create(ResourceRequest(testURL));
+    ASSERT_FALSE(cachedImage->resourceBuffer());
+    ASSERT_FALSE(cachedImage->errorOccurred());
+    ASSERT_FALSE(cachedImage->hasImage());
+    ASSERT_TRUE(cachedImage->getImage()->isNull());
 }
 
 TEST(ImageResourceTest, CancelOnDetach)