views: support vertical-drag-to-end on textfields

ui/views/style/platform_style.h

Index: ui/views/style/platform_style.h
diff --git a/ui/views/style/platform_style.h b/ui/views/style/platform_style.h
index e4240d49306a8920c8f6caf4f26d14b3a7459433..8a92fab141ee517a1998e1412076a5f0f5b5be8e 100644
--- a/ui/views/style/platform_style.h
+++ b/ui/views/style/platform_style.h
@@ -37,6 +37,10 @@ class PlatformStyle {
   // Creates the default scrollbar for the given orientation.
   static scoped_ptr<ScrollBar> CreateScrollBar(bool is_horizontal);
 
+  // True if dragging vertically above or below a textfield's bounds selects to
+  // the beginning or end of the text from the cursor, respectively.
+  static const bool kTextfieldDragVerticallyDragsToEnd;

[tapted, 2016/04/06 23:29:38]

this should be ordered before all the functions (see e.g.
http://crrev.com/1569113002/diff/470001/ui/views/style/platform_style.h where we
will git-conflict :p). order should be adjusted in the .cc's too

[Elly Fong-Jones, 2016/04/07 17:43:47]

Done.

+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PlatformStyle);
 };