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The virtual keyboard used on Chrome OS (in ash) is provided by an
extension. For athena, we cannot yet use the extension version of the
keyboard. As a short-term workaround, this patch introduces a web-ui
version of the keyboard for initial use. This patch provides a
simplistic implementation of some of the virtualKeyboardPrivate API
(sendKeyEvent, hideKeyboard) over WebUI.

This patch installs a webui controller (VKWebUIController) for the
keyboard URL (chrome://keyboard), and a message-handler (VKMessageHandler)
to process the incoming messages from the keyboard. These are installed
in the browser process. In the renderer process, this patch installs a
RenderViewObserver implementation (VirtualKeyboardBindingsImpl) which
provides the necessary bindings for the virtualKeyboardPrivate API
(VKBindings), and generates the appropriate webui messages by calling
chrome.send(). This lets us use the same HTML/JS/Polymer version of the
keyboard as in Chrome OS under ash/chrome.

For the keyboard to be completely functional, an implementation of
onTextInputBoxFocused will also be necessary. That will be provided in a
follow up CL.

BUG=380125
R=ben@chromium.org, bshe@chromium.org, oshima@chromium.org

Review URL: https://codereview.chromium.org/335793005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278687 0039d316-1c4b-4281-b951-d872f2087c98