Add new API for only moving the selection extent point.

public/web/WebFrame.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 436 matching lines @@
     // Expands the selection to a word around the caret and returns
     // true. Does nothing and returns false if there is no caret or
     // there is ranged selection.
     virtual bool selectWordAroundCaret() = 0;
 
     // DEPRECATED: Use moveRangeSelection.
     virtual void selectRange(const WebPoint& base, const WebPoint& extent) = 0;
 
     virtual void selectRange(const WebRange&) = 0;
 
+    // Move the selection extent point.
+    virtual void moveSelectionExtent(const WebPoint&) = 0;

[mlamouri (slow - plz ping), 2014/10/15 12:13:51]

Can't you define that in public/web/WebLocalFrame.h instead of WebFrame.h? Given
that you Chromium CL is using a WebLocalFrame and it's not defined in
WebRemoteFrame, it sounds like you could by pass entirely
WebFrame/WebRemoteFrame here.

[jdduke (slow), 2014/10/15 17:49:47]

I think it would be a little odd to restrict this method to WebLocalFrame, when
all of the related methods are declared in WebFrame.

Looking at the naming, I wonder if |moveRangeSelectionExtent| fits better with
the existing scheme, maybe not?

[christiank, 2014/10/17 14:30:24]

Sure, I'll move it to WebLocalFrame and rename it to moveRangeSelectionExtent
while at it.

+
     // Move the current selection to the provided window point/points. If the
     // current selection is editable, the new selection will be restricted to
     // the root editable element.
     virtual void moveRangeSelection(const WebPoint& base, const WebPoint& extent) = 0;
     virtual void moveCaretSelection(const WebPoint&) = 0;
 
     virtual bool setEditableSelectionOffsets(int start, int end) = 0;
     virtual bool setCompositionFromExistingText(int compositionStart, int compositionEnd, const WebVector<WebCompositionUnderline>& underlines) = 0;
     virtual void extendSelectionAndDelete(int before, int after) = 0;
 
@@ skipping 220 matching lines @@
     WebPrivateOwnPtr<OpenedFrameTracker> m_openedFrameTracker;
 };
 
 #if BLINK_IMPLEMENTATION
 Frame* toCoreFrame(const WebFrame*);
 #endif
 
 } // namespace blink
 
 #endif