Android: allow to kill a child process in instrumentation testing.

This patch exposes a method to kill a child process service of a given
pid, allowing regression integration test for http://crbug.com/399521 on
the embedder side.

BUG=399521

Review URL: https://codereview.chromium.org/441363003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288071 0039d316-1c4b-4281-b951-d872f2087c98

content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java

@@ -6,6 +6,7 @@ package org.chromium.content.browser;
 
 import android.content.Context;
 import android.graphics.SurfaceTexture;
+import android.os.RemoteException;
 import android.util.Log;
 import android.util.Pair;
 import android.view.Surface;
@@ -531,6 +532,23 @@ public class ChildProcessLauncher {
         return sServiceMap.size();
     }
 
+    /**
+     * Kills the child process for testing.
+     * @return true iff the process was killed as expected
+     */
+    @VisibleForTesting
+    public static boolean crashProcessForTesting(int pid) {
+        if (sServiceMap.get(pid) == null) return false;
+
+        try {
+            ((ChildProcessConnectionImpl) sServiceMap.get(pid)).crashServiceForTesting();
+        } catch (RemoteException ex) {
+            return false;
+        }
+
+        return true;
+    }
+
     private static native void nativeOnChildProcessStarted(long clientContext, int pid);
     private static native void nativeEstablishSurfacePeer(
             int pid, Surface surface, int primaryID, int secondaryID);