Migrate IME state update flow

content/public/android/java/src/org/chromium/content_public/browser/ImeEventObserver.java

Index: content/public/android/java/src/org/chromium/content_public/browser/ImeEventObserver.java
diff --git a/content/public/android/java/src/org/chromium/content_public/browser/ImeEventObserver.java b/content/public/android/java/src/org/chromium/content_public/browser/ImeEventObserver.java
new file mode 100644
index 0000000000000000000000000000000000000000..5ba308fa2ec14d33007a749f16de41c8384c41f1
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content_public/browser/ImeEventObserver.java
@@ -0,0 +1,22 @@
+// Copyright 2017 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_public.browser;
+
+/**
+ * Interface for the classes that need to be notified of IME changes.
+ */
+public interface ImeEventObserver {
+    /**
+     * Called to notify the delegate about synthetic/real key events before sending to renderer.
+     */
+    void onImeEvent();
+
+    /**
+     * Called when the focused node attribute is updated.
+     * @param editable {@code true} if the node becomes editable; else {@code false}.
+     * @param password indicates the node is of type password if {@code true}.
+     */
+    void onNodeAttributeUpdated(boolean editable, boolean password);
+}