Launch apps on link press in HTMLViewer

When pressing link in HTMLViewer, loading new page in
HTMLViewer fails.

With this commit pressing link in HTMLViewer will launch
new apps to load in the same tab.

Code is from ChromeWebView at https://chromium.googlesource.com
(see android_webview/java/src/org/chromium/android_webview/AwContentsClient.java)
commit f08cb003ea22c8c126279a8de1ac604e4dd13b0f
by Hui Shu.

Bug: 70605061
Test: Manual. Open a page with e.g. a Youtube link, press it
      and observe that Youtube app is open.
Change-Id: Iac4e053c3e03d002a162c4c38f3c9812806bdc92
1 file changed