Do not calculate composition bounds until IME requests.

content/public/android/javatests/src/org/chromium/content/browser/input/ImeLollipopTest.java

 // 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.content.browser.input;
 
 import android.annotation.TargetApi;
 import android.os.Build;
 import android.test.suitebuilder.annotation.MediumTest;
 import android.view.inputmethod.CursorAnchorInfo;
@@ skipping 40 matching lines @@
 
         // In "IMMEDIATE" mode, even when there's no change, we should be notified at least once.
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
                 mInputMethodManagerWrapper.clearLastCursorAnchorInfo();
             }
         });
         requestCursorUpdates(InputConnection.CURSOR_UPDATE_IMMEDIATE);
         waitForUpdateCursorAnchorInfoComposingText("abcd");
+
+        setComposingText("abcde", 2);
+        requestCursorUpdates(InputConnection.CURSOR_UPDATE_IMMEDIATE);
+        waitForUpdateCursorAnchorInfoComposingText("abcde");
     }
 
     private void requestCursorUpdates(final int cursorUpdateMode) {
         final InputConnection connection = mConnection;
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
                 connection.requestCursorUpdates(cursorUpdateMode);
             }
         });
@@ skipping 10 matching lines @@
                     return false;
                 }
 
                 String actual = (info == null ? "" : info.getComposingText().toString());
                 updateFailureReason("Expected: {" + expected + "}, Actual: {" + actual + "}");
                 return expected.equals(actual);
             }
         });
     }
 }