Chromium: add to support file uploading

This change adds function implementation in WebViewContentsClientAdapter
for supporting uploading file in browser. In Android 4.4, browser is based
on chromium not webkit engine, chromium engine support uploading file and
will callback to client to show file chooser, but android_webview client
has empty implementation within this callback for file chooser.

So we solve this issue by adding implementation in framework chromium
client which extends android_webview client, function in framework
webkit client and corresponding functions in browser app.

Change-Id: I2dbf6a39e68725b222650755dbf6b6882d4f209d
Merge tag 'android-4.4.3_r1' into HEAD

Android 4.4.3 release 1

Conflicts:
	chromium/java/com/android/webview/chromium/WebViewContentsClientAdapter.java

Change-Id: Ia744b48e21220c90da11ded272e73601270d21a7
reduce cookie tracking (2/4): add a way to count cookies

Change-Id: I471e284104467cd299072fbb6704f30d61e6ac02
Merge remote-tracking branch 'cm/cm-11.0' into kk-4.4