Introduce ThreadedInputConnection behind a switch

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 9f2b522601a2a8fdbf70faed4e447e521631f6e4..63fbffd5e8735906d659dab2632be1b501e71955 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -334,6 +334,7 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
             contentViewCore.mIsMobileOptimizedHint = false;
             contentViewCore.hidePopupsAndClearSelection();
             contentViewCore.resetScrollInProgress();
+            contentViewCore.resetImeAdapter();

[Ted C, 2016/02/02 23:14:42]

you can just do contentViewCore.mImeAdapter.reset();

Then you don't need this new method (and is consistent across call sites)

[Changwan Ryu, 2016/02/11 16:21:07]

Done.

[Ted C, 2016/02/17 19:09:33]

Looks like this didn't land?

[Changwan Ryu, 2016/02/18 06:03:26]

My bad, it's done now.

         }
 
         private void determinedProcessVisibility() {
@@ -934,6 +935,7 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
         mWebContentsObserver = null;
         setSmartClipDataListener(null);
         setZoomControlsDelegate(null);
+        mImeAdapter.reset();
         // TODO(igsolla): address TODO in ContentViewClient because ContentViewClient is not
         // currently a real Null Object.
         //
@@ -3088,6 +3090,11 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
         }
     }
 
+    @VisibleForTesting
+    public WebContentsObserver getWebContentsObserverForTest() {
+        return mWebContentsObserver;
+    }
+
     /**
      * Offer a long press gesture to the embedding View, primarily for WebView compatibility.
      *
@@ -3113,6 +3120,10 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
         if (potentiallyActiveFlingCount > 0) updateGestureStateListener(GestureEventType.FLING_END);
     }
 
+    private void resetImeAdapter() {
+        mImeAdapter.reset();
+    }
+
     private float getWheelScrollFactorInPixels() {
         if (mWheelScrollFactorInPixels == 0) {
             TypedValue outValue = new TypedValue();