views: add Harmony dialog width support

ui/views/window/dialog_delegate.cc

Index: ui/views/window/dialog_delegate.cc
diff --git a/ui/views/window/dialog_delegate.cc b/ui/views/window/dialog_delegate.cc
index d98274cde71a90871a5fd96875f70838ca61cb3f..badba3d61921210a0a3f81cac1d2ecfba1c3b8da 100644
--- a/ui/views/window/dialog_delegate.cc
+++ b/ui/views/window/dialog_delegate.cc
@@ -10,6 +10,7 @@
 #include "build/build_config.h"
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/base/l10n/l10n_util.h"
+#include "ui/base/material_design/material_design_controller.h"
 #include "ui/gfx/color_palette.h"
 #include "ui/strings/grit/ui_strings.h"
 #include "ui/views/bubble/bubble_border.h"
@@ -265,4 +266,13 @@ void DialogDelegateView::ViewHierarchyChanged(
     NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 }
 
+gfx::Size DialogDelegateView::GetPreferredSize() const {
+  if (!ui::MaterialDesignController::IsSecondaryUiMaterial() ||
+      dialog_width() == DIALOG_WIDTH_UNSPECIFIED) {
+    return View::GetPreferredSize();
+  }
+  int width_px = dialog_width() * 32;

[Evan Stade, 2016/10/03 19:04:19]

actually dp, not px. I'd suggest leaving the unit off as  GetPreferredSize
always expects the same thing (dp).

[Elly Fong-Jones, 2016/10/05 13:20:31]

Done.

+  return gfx::Size(width_px, GetHeightForWidth(width_px));
+}
+
 }  // namespace views