Make touch-resizing windows to screen edge possible

ash/wm/workspace/workspace_window_resizer.cc

Index: ash/wm/workspace/workspace_window_resizer.cc
diff --git a/ash/wm/workspace/workspace_window_resizer.cc b/ash/wm/workspace/workspace_window_resizer.cc
index 25430933827c63762fb0e9b7dcc1cc1d348f5370..5dadccfef0e13a6b4bf140af600840bd7a062c68 100644
--- a/ash/wm/workspace/workspace_window_resizer.cc
+++ b/ash/wm/workspace/workspace_window_resizer.cc
@@ -231,6 +231,9 @@ const int WorkspaceWindowResizer::kMinOnscreenHeight = 32;
 // static
 const int WorkspaceWindowResizer::kScreenEdgeInset = 8;
 
+// static
+const int WorkspaceWindowResizer::kScreenEdgeInsetForTouchResize = 16;
+
 // Represents the width or height of a window with constraints on its minimum
 // and maximum size. 0 represents a lack of a constraint.
 class WindowSize {
@@ -327,7 +330,10 @@ void WorkspaceWindowResizer::Drag(const gfx::Point& location_in_parent,
       switches::kAshEnableStickyEdges)) {
     sticky_size = kStickyDistancePixels;
   } else {
-    sticky_size = kScreenEdgeInset;
+    if ((details_.bounds_change & kBoundsChange_Resizes) && details_.is_touch)
+      sticky_size = kScreenEdgeInsetForTouchResize;
+    else
+      sticky_size = kScreenEdgeInset;
   }
   // |bounds| is in |window()->parent()|'s coordinates.
   gfx::Rect bounds = CalculateBoundsForDrag(details_, location_in_parent);