[Android] Add selection handle tests

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 b6e5580acc22588c3b1a8c5aa8532c54bf127cb1..8d45f21bb79c6821a1dbb97cc5c18ba3a1ca3cdb 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
@@ -1195,10 +1195,20 @@ import java.util.Map;
         if (mNativeContentViewCore != 0) nativeClearHistory(mNativeContentViewCore);
     }
 
-    String getSelectedText() {
+    /**
+     * @return The selected text (empty if no text selected).
+     */
+    public String getSelectedText() {
         return mHasSelection ? mLastSelectedText : "";
     }
 
+    /**
+     * @return Whether the current selection is editable (false if no text selected).
+     */
+    public boolean isSelectionEditable() {
+        return mHasSelection ? mSelectionEditable : false;
+    }
+
     // End FrameLayout overrides.
 
     /**
@@ -1449,6 +1459,10 @@ import java.util.Map;
         }
     }
 
+    public boolean isSelectActionBarShowing() {
+        return mActionMode != null;
+    }
+
     private void resetGestureDetectors() {
         mContentViewGestureHandler.resetGestureHandlers();
     }
@@ -2022,10 +2036,16 @@ import java.util.Map;
         return mInsertionHandleController;
     }
 
+    @VisibleForTesting
     public InsertionHandleController getInsertionHandleControllerForTest() {
         return mInsertionHandleController;
     }
 
+    @VisibleForTesting
+    public SelectionHandleController getSelectionHandleControllerForTest() {
+        return mSelectionHandleController;
+    }
+
     private void updateHandleScreenPositions() {
         if (isSelectionHandleShowing()) {
             mSelectionHandleController.setStartHandlePosition(