Implement "appinstalled" event on Android.

chrome/browser/android/banners/app_banner_infobar_delegate_android.cc

Index: chrome/browser/android/banners/app_banner_infobar_delegate_android.cc
diff --git a/chrome/browser/android/banners/app_banner_infobar_delegate_android.cc b/chrome/browser/android/banners/app_banner_infobar_delegate_android.cc
index a42484fb8d4db0ff0a5209d5a031302f937b13bc..c67e1f9764c7be80dfedfc78dad6706e4191d299 100644
--- a/chrome/browser/android/banners/app_banner_infobar_delegate_android.cc
+++ b/chrome/browser/android/banners/app_banner_infobar_delegate_android.cc
@@ -279,6 +279,8 @@ void AppBannerInfoBarDelegateAndroid::SendBannerAccepted(
           web_contents->GetMainFrame()->GetRoutingID(),
           event_request_id_,
           platform));
+  if (weak_manager_)
+    weak_manager_->OnInstall();

[dominickn, 2016/10/12 22:35:09]

We're already sending a message to the renderer here. It would be nice if we
could combine them. My patch makes the first message go straight to the
BeforeInstallPromptEvent; perhaps that can then ask the Frame to call OnInstall?

Also, my CL moves the IPC call from here to AppBannerManager so you probably
won't need to have this call in here at all - it'll be in AppBannerManager.

[Matt Giuca, 2016/12/09 04:36:48]

Hmmm yeah your CL did make this easier but it's still a bit messy to do that
because OnInstall can get called from not the banner. I prefer not to go through
my own mojo message for some cases but hitch-hike in your mojo message for this
one. Hard to understand.

Not worth it given how rare this message is sent.

 }
 
 infobars::InfoBarDelegate::InfoBarIdentifier