Fixed several accessibility issues in bookmark bubble dialog:

1. BookmarkBubbleView: added BookmarkBubbleView::GetAccessibleState() so we can say what this UI is all about
2. BookmarkBubbleView: added spoken feedback to [Name] text box
3. BookmarkBubbleView: changed spoken feedback for for [Folder] to "Bookmark folder"
4. fixed AccessibilityEventRouterViews::GetViewContext() to prevent drilling down into child elements of a dialog if the dialog defines AccessibleViewState::name already.
5. BookmarkEditorView: added BookmarkBubbleView::GetAccessibleState() so we can say what this UI is all about
6. BookmarkEditorView: changed spoken feedback for for [Name] and [URL] text edit fields


BUG=177321,127042
TEST=manual with spoken feedback turned on

Review URL: https://codereview.chromium.org/79273002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236841 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236841