Removes most of aura dependencies from DefaultState

ash/wm/common/window_positioning_utils.cc

Index: ash/wm/common/window_positioning_utils.cc
diff --git a/ash/wm/common/window_positioning_utils.cc b/ash/wm/common/window_positioning_utils.cc
index 7ba629babc2eadcc9004da5bf1fd6c96bde662ad..a1105ea4df1dc0db54dd6c1c775d783ebe6c6fd1 100644
--- a/ash/wm/common/window_positioning_utils.cc
+++ b/ash/wm/common/window_positioning_utils.cc
@@ -6,12 +6,29 @@
 
 #include <algorithm>
 
+#include "ash/wm/common/wm_screen_util.h"
+#include "ash/wm/common/wm_window.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace ash {
 namespace wm {
 
+namespace {
+
+// Returns the default width of a snapped window.
+int GetDefaultSnappedWindowWidth(WmWindow* window) {
+  const float kSnappedWidthWorkspaceRatio = 0.5f;
+
+  int work_area_width = GetDisplayWorkAreaBoundsInParent(window).width();
+  int min_width = window->GetMinimumSize().width();
+  int ideal_width =
+      static_cast<int>(work_area_width * kSnappedWidthWorkspaceRatio);
+  return std::min(work_area_width, std::max(ideal_width, min_width));
+}
+
+}  // namespace
+
 void AdjustBoundsSmallerThan(const gfx::Size& max_size, gfx::Rect* bounds) {
   bounds->set_width(std::min(bounds->width(), max_size.width()));
   bounds->set_height(std::min(bounds->height(), max_size.height()));
@@ -46,5 +63,19 @@ void AdjustBoundsToEnsureMinimumWindowVisibility(const gfx::Rect& visible_area,
                                        kMinimumOnScreenArea, bounds);
 }
 
+gfx::Rect GetDefaultLeftSnappedWindowBoundsInParent(wm::WmWindow* window) {
+  gfx::Rect work_area_in_parent(GetDisplayWorkAreaBoundsInParent(window));
+  return gfx::Rect(work_area_in_parent.x(), work_area_in_parent.y(),
+                   GetDefaultSnappedWindowWidth(window),
+                   work_area_in_parent.height());
+}
+
+gfx::Rect GetDefaultRightSnappedWindowBoundsInParent(wm::WmWindow* window) {
+  gfx::Rect work_area_in_parent(GetDisplayWorkAreaBoundsInParent(window));
+  int width = GetDefaultSnappedWindowWidth(window);
+  return gfx::Rect(work_area_in_parent.right() - width, work_area_in_parent.y(),
+                   width, work_area_in_parent.height());
+}
+
 }  // namespace wm
 }  // namespace ash