Improved the reporting of background color information.

third_party/WebKit/Source/modules/accessibility/AXObject.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXObject.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXObject.cpp b/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
index da4d72af218316f257065688ce9d7808d3255574..ff05360bc8c1bc8986b3c8be1741c74801299c02 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
@@ -512,6 +512,7 @@ void AXObject::updateCachedAttributeValuesIfNeeded() const
         return;
 
     m_lastModificationCount = cache.modificationCount();
+    m_cachedBackgroundColor = computeBackgroundColor();
     m_cachedIsInertOrAriaHidden = computeIsInertOrAriaHidden();
     m_cachedIsDescendantOfLeafNode = (leafNodeAncestor() != 0);
     m_cachedIsDescendantOfDisabledNode = (disabledAncestor() != 0);
@@ -924,6 +925,12 @@ String AXObject::textFromAriaDescribedby(AXRelatedObjectVector* relatedObjects)
     return textFromElements(true, visited, elements, relatedObjects);
 }
 
+RGBA32 AXObject::backgroundColor() const
+{
+    updateCachedAttributeValuesIfNeeded();
+    return m_cachedBackgroundColor;
+}
+
 AccessibilityOrientation AXObject::orientation() const
 {
     // In ARIA 1.1, the default value for aria-orientation changed from