Fix OSK flickering issue

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 98a547993ef0502681711acb5fdd371fd6b1a557..b6831241316c5f123399d11d290c0c0ff81afef2 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
@@ -2484,8 +2484,9 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
             boolean focusedNodeIsPassword = (textInputType == TextInputType.PASSWORD);
             if (!focusedNodeEditable) hidePastePopup();
 
+            mImeAdapter.attach(nativeImeAdapterAndroid);
             mImeAdapter.updateKeyboardVisibility(
-                    nativeImeAdapterAndroid, textInputType, textInputFlags, showImeIfNeeded);
+                    textInputType, textInputFlags, showImeIfNeeded);
 
             if (mInputConnection != null) {
                 mInputConnection.updateState(text, selectionStart, selectionEnd, compositionStart,
@@ -2675,7 +2676,6 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
     }
 
     private boolean canPaste() {
-        if (!mFocusedNodeEditable) return false;
         return ((ClipboardManager) mContext.getSystemService(
                 Context.CLIPBOARD_SERVICE)).hasPrimaryClip();
     }