Enable content layer to initCommandLine on Android

Enable content layer to initCommandLine on Android

Previously, in order to initialise CommandLine, you had to know whether
you were running as part of Content Shell, Chrome Shell, or Chrome, and
call the corresponding method.

This led to ugly code like ChromiumSyncAdapter.java having to provide an
abstract initCommandLine method that gets implemented by the subclasses
ChromeShellSyncAdapter.java and ChromeBrowserSyncAdapter.java.

Instead this patch adds an abstract initCommandLine method on
ContentApplication.java, implemented by the subclasses:
- ContentShellApplication
- ChromeShellApplication
- ChromeMobileApplication
- ChromeNativeTestApplication

Thus any code in the content layer can now initialize CommandLine with:
    ContentApplication.initCommandLine(context);

BUG=350384
TBR=fgorski@chromium.org
CQ_TRYBOTS=tryserver.chromium:android_aosp,android_arm64_dbg_recipe,android_chromium_gn_compile_dbg,android_chromium_gn_compile_rel,android_clang_dbg_recipe,android_dbg_tests_recipe

Committed: https://crrev.com/c92f3e1f7b7f0bf224daf62e9512b871c4d07147
Cr-Commit-Position: refs/heads/master@{#297830}

[johnme, 2014-09-30 18:10:00]

johnme@chromium.org changed reviewers:
+ cjhopman@chromium.org, yfriedman@chromium.org

[Yaron, 2014-09-30 20:09:32]

lgtm

[cjhopman, 2014-09-30 20:40:50]

lgtm

https://codereview.chromium.org/615153002/diff/1/chrome/android/javatests/src...
File
chrome/android/javatests/src/org/chromium/chrome/browser/sync/ChromiumSyncAdapterTest.java
(left):

https://codereview.chromium.org/615153002/diff/1/chrome/android/javatests/src...
chrome/android/javatests/src/org/chromium/chrome/browser/sync/ChromiumSyncAdapterTest.java:48:
mCommandlineInitialized = true;
These tests are now actually initializing the command line and they weren't
explicitly before I believe (though it may have been initialized by something
else). Not sure if we care about that or not.

[johnme, 2014-10-02 12:57:37]

The CQ bit was checked by johnme@chromium.org

[commit-bot: I haz the power, 2014-10-02 12:57:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/615153002/1

[johnme, 2014-10-02 13:51:52]

The CQ bit was checked by johnme@chromium.org

[commit-bot: I haz the power, 2014-10-02 13:52:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/615153002/20001

[commit-bot: I haz the power, 2014-10-02 14:53:00]

Committed patchset #2 (id:20001) as 5a5958bd17529086777a06a66588b6accdcc0524

[commit-bot: I haz the power, 2014-10-02 14:53:39]

Patchset 2 (id:??) landed as
https://crrev.com/c92f3e1f7b7f0bf224daf62e9512b871c4d07147
Cr-Commit-Position: refs/heads/master@{#297830}