Upstream: ChildProcessLauncher connects renderer processes of WebAPKs.

base/android/library_loader/library_loader_hooks.h

Index: base/android/library_loader/library_loader_hooks.h
diff --git a/base/android/library_loader/library_loader_hooks.h b/base/android/library_loader/library_loader_hooks.h
index 3e8969bc59a2c93671bf3e2a4e9d03fefffab096..90670a93418ee7c5cf7a199d4c1a12b6a5f0e5e8 100644
--- a/base/android/library_loader/library_loader_hooks.h
+++ b/base/android/library_loader/library_loader_hooks.h
@@ -25,6 +25,8 @@ enum LibraryProcessType {
   PROCESS_WEBVIEW = 3,
   // Shared library is running in child process as part of webview.
   PROCESS_WEBVIEW_CHILD = 4,
+  // Shared library is running in child process as part of WebAPK.
+  PROCESS_WEBAPK_CHILD = 5,

[michaelbai, 2016/06/02 00:14:51]

Do you really need separated type for WebAPK? From this patch,
PROCESS_WEBAPK_CHILD is defined and set, isn't used anywhere, you shouldn't have
new process type if you don't have to.

[Xi Han, 2016/06/07 18:49:59]

Hmmm, we check the type and did something special for WebAPK when loading the
Chrome's shared library in WebAPK. We may be able to find another way to do it,
but not 100% sure. I will add a TODO here.

 };
 
 // Record any pending renderer histogram value as histograms.  Pending values