Add a border radius property to inherit it from a parent in a fallback content

third_party/WebKit/Source/core/html/HTMLImageFallbackHelper.cpp

Index: third_party/WebKit/Source/core/html/HTMLImageFallbackHelper.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLImageFallbackHelper.cpp b/third_party/WebKit/Source/core/html/HTMLImageFallbackHelper.cpp
index 8994abc89d7d3e8b5f940a23debdd022b3592f41..a21b8940f7853c8b074b58feac1ae78c4af04d40 100644
--- a/third_party/WebKit/Source/core/html/HTMLImageFallbackHelper.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLImageFallbackHelper.cpp
@@ -44,6 +44,7 @@ void HTMLImageFallbackHelper::createAltTextShadowTree(Element& element)
     container->setInlineStyleProperty(CSSPropertyDisplay, CSSValueInlineBlock);
     container->setInlineStyleProperty(CSSPropertyBoxSizing, CSSValueBorderBox);
     container->setInlineStyleProperty(CSSPropertyPadding, 1, CSSPrimitiveValue::UnitType::Pixels);
+    container->setInlineStyleProperty(CSSPropertyBorderRadius, AtomicString("inherit", AtomicString::ConstructFromLiteral));

[pdr., 2016/03/31 04:20:11]

I still don't see why this is needed. Which test fails without this change?

[Miyoung Shin(c), 2016/04/03 14:39:25]

border-hittest-with-image-fallback.html is failed without this change.

BTW, I checked how to draw the missed image having border-radius on FireFox,
they apply the rounded border to the missed image but we don't.
I think we need to draw the rounded border of the missed image and it works fine
with this path like them.

 
     RefPtrWillBeRawPtr<HTMLImageElement> brokenImage = HTMLImageElement::create(element.document());
     container->appendChild(brokenImage);