WIP - Control the lifetime of RenderThreadManager from Java.

android_webview/java/src/org/chromium/android_webview/browser/SharedRendererState.java

Index: android_webview/java/src/org/chromium/android_webview/browser/SharedRendererState.java
diff --git a/android_webview/java/src/org/chromium/android_webview/browser/SharedRendererState.java b/android_webview/java/src/org/chromium/android_webview/browser/SharedRendererState.java
new file mode 100644
index 0000000000000000000000000000000000000000..6c513324563c593d10aa1ca3e268bc4886249d9a
--- /dev/null
+++ b/android_webview/java/src/org/chromium/android_webview/browser/SharedRendererState.java
@@ -0,0 +1,43 @@
+// Copyright 2016 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.android_webview.browser;
+
+import org.chromium.base.annotations.JNINamespace;
+import org.chromium.content.common.CleanupReference;
+
+/**
+ */
+@JNINamespace("android_webview")
+public class SharedRendererState {
+    private static final class DestroyRunnable implements Runnable {
+        private final long mNativeSharedRendererState;
+
+        private DestroyRunnable(long nativeSharedRendererState) {
+            mNativeSharedRendererState = nativeSharedRendererState;
+        }
+        @Override
+        public void run() {
+            nativeDestroy(mNativeSharedRendererState);
+        }
+    }
+
+    private long mNativeSharedRendererState;
+    private CleanupReference mCleanupReference;
+
+    public SharedRendererState(long nativeSharedRendererState) {
+        mNativeSharedRendererState = nativeSharedRendererState;
+        mCleanupReference =
+                new CleanupReference(this, new DestroyRunnable(mNativeSharedRendererState));
+    }
+
+    public void destroy() {
+        if (mCleanupReference != null) {
+            mCleanupReference.cleanupNow();

[boliu, 2016/04/01 03:13:39]

There is no reason for a cleanupReference. This object should have an explicit
place to be destroyed, when AwContents is detached (or in that new callback in
N)

+            mCleanupReference = null;
+        }
+    }
+
+    private static native void nativeDestroy(long sharedRendererState);
+}