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..279c1ec631f0f83dec9008f7ba465c9c9b358dc8 100644
--- a/ash/wm/workspace/workspace_window_resizer.cc
+++ b/ash/wm/workspace/workspace_window_resizer.cc
@@ -80,6 +80,10 @@ namespace {
 // to move or resize beyond that edge.
 const int kStickyDistancePixels = 64;
 
+// Snapping distance used instead of WorkspaceWindowResizer::kScreenEdgeInset
+// when resizing a window using touchscreen.
+const int kScreenEdgeInsetForTouchResize = 16;
+
 // Returns true if the window should stick to the edge.
 bool ShouldStickToEdge(int distance_from_edge, int sticky_size) {
   if (CommandLine::ForCurrentProcess()->HasSwitch(
@@ -327,7 +331,10 @@ 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);