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Standalone & Trichrome WebView now unconditionally includes
LauncherActivity (defined in DeveloperUiLauncherManifest), and
conditionally set the enabled state to true/false based on GN args
(webview_devui_show_icon, which is configured by android_channel).

This is a step toward resolving https://crbug.com/1047824, although this
is not a complete solution since this doesn't change the monochrome
behavior.

Fixed: 1140741
Bug: 1047824
Test: aapt dump xmltree TrichromeWebViewGoogle.apk AndroidManifest.xml | grep -A 2 'LauncherActivity'
Test: Same for TrichromeWebViewGoogleBeta, TrichromeWebViewGoogleStable, SystemWebViewGoogle, SystemWebView
Test: adb shell pm enable com.google.android.webview.debug/org.chromium.android_webview.devui.LauncherActivity
Test: adb shell pm disable com.google.android.webview.debug/org.chromium.android_webview.devui.LauncherActivity
Change-Id: Id996965643a6fea31a34ebe39fb5b2b8ac5f5c0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500435Reviewed-by: Hazem Ashmawy <hazems@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Richard Coles <torne@chromium.org>
Auto-Submit: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822231}