Convert commitText("\n") to synthetic Enter key press.

content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java

Index: content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java b/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
index 61aceec9bd50f8d0cf4baa19c0d03010251d39bc..760d020af02a2097a3d0b2d3c4c982d2c8265cf8 100644
--- a/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
+++ b/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
@@ -452,8 +452,15 @@ public class ImeAdapter {
 
     boolean commitText(CharSequence text) {
         if (mNativeImeAdapterAndroid == 0) return false;
-        mViewEmbedder.onImeEvent();
 
+        // One WebView app detects Enter in JS by looking at KeyDown (http://crbug/577967).
+        if (text.equals("\n")) {
+            sendSyntheticKeyPress(KeyEvent.KEYCODE_ENTER,
+                    KeyEvent.FLAG_SOFT_KEYBOARD | KeyEvent.FLAG_KEEP_TOUCH_MODE);
+            return true;
+        }
+
+        mViewEmbedder.onImeEvent();
         long timestampMs = SystemClock.uptimeMillis();
         nativeSendSyntheticKeyEvent(mNativeImeAdapterAndroid, WebInputEventType.RawKeyDown,
                 timestampMs, COMPOSITION_KEY_CODE, 0, 0);