[Merge m58] Abstracting parameters passed to child processes on Android.

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.content.browser;
 
 /**
  * Constants to be used by child processes.
  */
-public class ChildProcessConstants {
-    // Names of items placed in the bind or start command intent, or connection bundle.
-    // Used to pass the command line params to child processes.
+public interface ChildProcessConstants {
+    // Below are the names for the items placed in the bind or start command intent.
+    // Note that because that intent maybe reused if a service is restarted, none should be process
+    // specific.
+
+    // Key in the binding Intent's Bundle for the ChromiumLinkerParams.
+    public static final String EXTRA_LINKER_PARAMS =
+            "com.google.android.apps.chrome.extra.linker_params";
+
+    // Key in the binding Intent's Bundle for the type of process the child is.
+    public static final String EXTRA_LIBRARY_PROCESS_TYPE =
+            "com.google.android.apps.chrome.extra.library_process_type";
+
+    // Below are the names for the items placed in the Bundle passed in the
+    // IChildProcessService.setupConnection call, once the connection has been established.
+
+    // Key for the command line.
     public static final String EXTRA_COMMAND_LINE =
             "com.google.android.apps.chrome.extra.command_line";
-    // Used to pass file descriptors to child processes.
+
+    // Key for the file descriptors that should be mapped in the child process..
     public static final String EXTRA_FILES = "com.google.android.apps.chrome.extra.extraFiles";
-    // Used to pass the CPU core count to child processes.
+
+    // Key for the number of CPU cores.
     public static final String EXTRA_CPU_COUNT = "com.google.android.apps.chrome.extra.cpu_count";
-    // Used to pass the CPU features mask to child processes.
+
+    // Key for the CPU features mask.
     public static final String EXTRA_CPU_FEATURES =
             "com.google.android.apps.chrome.extra.cpu_features";
 }