refactor android_webview_shell and add page cycler
The previous android_webview/toos/WebViewShell directory is now separated into:
android_webview/tools/WebViewShell/
android_webview/tools/WebViewShellTest/
with android_webview/tools/PageCycler/ added
The target name are changed to system_webview_shell_apk, system_webview_shell_layout_test_apk, and system_webview_shell_page_cycler_apk.
BUG=
Committed:
https://crrev.com/2a9e4d1100e6b15d591f193c152bb705774c9c38
Cr-Commit-Position: refs/heads/master@{#353105}