ash: Refactor some code that snaps windows.

ash/wm/workspace/snap_sizer.cc

Index: ash/wm/workspace/snap_sizer.cc
diff --git a/ash/wm/workspace/snap_sizer.cc b/ash/wm/workspace/snap_sizer.cc
index 2a536aa5208070e249fbfa9a8812616a863f784d..5788481d8d4dd6a98721fa61c0545180e4a76563 100644
--- a/ash/wm/workspace/snap_sizer.cc
+++ b/ash/wm/workspace/snap_sizer.cc
@@ -7,7 +7,9 @@
 #include <cmath>
 
 #include "ash/screen_ash.h"
+#include "ash/wm/property_util.h"
 #include "ash/wm/window_resizer.h"
+#include "ash/wm/window_util.h"
 #include "ui/aura/window.h"
 #include "ui/gfx/screen.h"
 
@@ -86,6 +88,27 @@ SnapSizer::SnapSizer(aura::Window* window,
 SnapSizer::~SnapSizer() {
 }
 
+void SnapSizer::SnapWindow(aura::Window* window, SnapSizer::Edge edge) {
+  if (!wm::CanSnapWindow(window))
+    return;
+  internal::SnapSizer sizer(window, gfx::Point(), edge,
+      internal::SnapSizer::OTHER_INPUT);
+  if (wm::IsWindowFullscreen(window) || wm::IsWindowMaximized(window)) {
+    // Before we can set the bounds we need to restore the window.
+    // Restoring the window will set the window to its restored bounds.
+    // To avoid an unnecessary bounds changes (which may have side effects)
+    // we set the restore bounds to the bounds we want, restore the window,
+    // then reset the restore bounds. This way no unnecessary bounds
+    // changes occurs and the original restore bounds is remembered.
+    gfx::Rect restore = *GetRestoreBoundsInScreen(window);
+    SetRestoreBoundsInParent(window, sizer.GetSnapBounds(window->bounds()));
+    wm::RestoreWindow(window);
+    SetRestoreBoundsInScreen(window, restore);
+  } else {
+    window->SetBounds(sizer.GetSnapBounds(window->bounds()));
+  }
+}
+
 void SnapSizer::Update(const gfx::Point& location) {
   // See description above for details on this behavior.
   num_moves_since_adjust_++;