Fix composition key-code after switching to a new input field.

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

 // Copyright 2013 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.app.Activity;
 import android.content.ClipData;
 import android.content.ClipboardManager;
 import android.content.Context;
@@ skipping 464 matching lines @@
             }
         });
 
         // TODO(aurimas): remove this workaround when crbug.com/278584 is fixed.
         waitAndVerifyEditableCallback(mConnection.mImeUpdateQueue, 2, "hello", 5, 5, -1, -1);
         // The second new line is not a user visible/editable one, it is a side-effect of Blink
         // using <br> internally.
         waitAndVerifyEditableCallback(mConnection.mImeUpdateQueue, 3, "hello\n\n", 6, 6, -1, -1);
     }
 
+    @SmallTest
+    @Feature({"TextInput", "Main"})
+    public void testTransitionsWhileComposingText() throws Throwable {
+        DOMUtils.focusNode(mContentViewCore, "textarea");
+        assertWaitForKeyboardStatus(true);
+
+        mConnection = (TestAdapterInputConnection) getAdapterInputConnection();
+        waitAndVerifyEditableCallback(mConnection.mImeUpdateQueue, 0, "", 0, 0, -1, -1);
+
+        // H
+        expectUpdateStateCall(mConnection);
+        setComposingText(mConnection, "h", 1);
+        assertEquals(KeyEvent.KEYCODE_H, mImeAdapter.mLastSyntheticKeyCode);
+
+        // Simulate switch of input fields.
+        finishComposingText(mConnection);
+
+        // H
+        expectUpdateStateCall(mConnection);
+        setComposingText(mConnection, "h", 1);
+        assertEquals(KeyEvent.KEYCODE_H, mImeAdapter.mLastSyntheticKeyCode);
+    }
+
     private void performGo(final AdapterInputConnection inputConnection,
             TestCallbackHelperContainer testCallbackHelperContainer) throws Throwable {
         handleBlockingCallbackAction(
                 testCallbackHelperContainer.getOnPageFinishedHelper(),
                 new Runnable() {
                     @Override
                     public void run() {
                         inputConnection.performEditorAction(EditorInfo.IME_ACTION_GO);
                     }
                 });
@@ skipping 217 matching lines @@
         public void assertEqualState(String text, int selectionStart, int selectionEnd,
                 int compositionStart, int compositionEnd) {
             assertEquals("Text did not match", text, mText);
             assertEquals("Selection start did not match", selectionStart, mSelectionStart);
             assertEquals("Selection end did not match", selectionEnd, mSelectionEnd);
             assertEquals("Composition start did not match", compositionStart, mCompositionStart);
             assertEquals("Composition end did not match", compositionEnd, mCompositionEnd);
         }
     }
 }