[Contextual Search] Pass selection coordinate to ContentViewClient.

BUG=415656

Review URL: https://codereview.chromium.org/583583005

Cr-Commit-Position: refs/heads/master@{#295802}

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

@@ -131,12 +131,24 @@ public class ContentViewClient {
 
     /**
      * Notification that a selection or insertion-related event has occurred.
-     * TODO(donnd): Remove this and instead expose a ContextualSearchClient, crbug.com/403001.
+     * TODO(pedrosimonetti): remove this method once downstream code has been updated to use
+     * the other signature.
      * @param eventType The selection event type, see {@link SelectionEventType}.
      */
     public void onSelectionEvent(int eventType) {
     }
 
+    /**
+     * Notification that a selection or insertion-related event has occurred.
+     * TODO(donnd): Remove this and instead expose a ContextualSearchClient, crbug.com/403001.
+     * @param eventType The selection event type, see {@link SelectionEventType}.
+     * @param posXPix The x coordinate of the selection start handle.
+     * @param posYPix The y coordinate of the selection start handle.
+     */
+    public void onSelectionEvent(int eventType, float posXPix, float posYPix) {
+        onSelectionEvent(eventType);
+    }
+
     /**
      * Called when a new content intent is requested to be started.
      */

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

@@ -2021,7 +2021,9 @@ public class ContentViewCore
             default:
                 assert false : "Invalid selection event type.";
         }
-        getContentViewClient().onSelectionEvent(eventType);
+
+        final float scale = mRenderCoordinates.getDeviceScaleFactor();
+        getContentViewClient().onSelectionEvent(eventType, posXDip * scale, posYDip * scale);
     }
 
     private void hideTextHandles() {