[WIP] Make content_shell run under Wayland

ui/views/widget/desktop_aura/desktop_screen_wayland.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/views/widget/desktop_aura/desktop_screen_wayland.h"
+
+#include "ui/aura/window.h"
+#include "ui/display/display.h"
+#include "ui/display/screen.h"
+#include "ui/ozone/platform/wayland/wayland_display.h"
+#include "ui/views/widget/desktop_aura/desktop_screen.h"
+
+namespace views {
+
+////////////////////////////////////////////////////////////////////////////////
+// DesktopScreenWayland, public:
+DesktopScreenWayland::DesktopScreenWayland()
+    : display::Screen(),
+      displays_(),

[tonikitoo, 2016/06/06 15:29:59]

Is this needed?

[joone, 2016/06/06 18:22:22]

It needs to initialize the vector.

+      isOutputSizeInitialized(false) {
+
+  ui::WaylandDisplay::GetInstance()->SetDesktopScreenDelegate(this);
+  // Set a dummy display::Display to provide a display::Display to
+  // initialize CC.
+  SetGeometry(0, gfx::Rect(0, 0, 0, 0));

[tonikitoo, 2016/06/06 15:29:59]

Question: Is this call here temporarily for the reason of avoid an initial crash
(as I also faced it)? Or it is actually needed on the long run?

[joone, 2016/06/06 18:22:22]

Yes, it allows us to avoid the initial crash.

+}
+
+DesktopScreenWayland::~DesktopScreenWayland() {
+}
+
+void DesktopScreenWayland::SetGeometry(int32_t name,
+      const gfx::Rect& geometry) {
+  display::Display* matching = nullptr;
+  for (std::vector<display::Display>::iterator it = displays_.begin();
+      it != displays_.end(); ++it) {
+    if (name == it->id())
+      matching = &*it;
+  }
+
+  std::vector<display::Display> old_displays = displays_;
+  if (!isOutputSizeInitialized) {
+    // Remove the dummy display::Display.
+    displays_.clear();
+    isOutputSizeInitialized = true;
+  }
+
+  if (!matching)
+    displays_.push_back(display::Display(name, geometry));
+  else
+    matching->set_bounds(geometry);
+
+  change_notifier_.NotifyDisplaysChanged(old_displays, displays_);
+}
+
+// Overridden from display::Screen:
+gfx::Point DesktopScreenWayland::GetCursorScreenPoint() {
+  return gfx::Point();
+}
+
+bool DesktopScreenWayland::IsWindowUnderCursor(gfx::NativeWindow window) {
+  return true;
+}
+
+gfx::NativeWindow DesktopScreenWayland::GetWindowAtScreenPoint(
+    const gfx::Point& point) {
+  return nullptr;
+}
+
+int DesktopScreenWayland::GetNumDisplays() const {
+  return displays_.size();
+}
+
+std::vector<display::Display> DesktopScreenWayland::GetAllDisplays() const {
+  return displays_;
+}
+
+display::Display DesktopScreenWayland::GetDisplayNearestWindow(
+    gfx::NativeView window) const {
+  return GetPrimaryDisplay();
+}
+
+display::Display DesktopScreenWayland::GetDisplayNearestPoint(
+    const gfx::Point& point) const {
+  return GetPrimaryDisplay();
+}
+
+display::Display DesktopScreenWayland::GetDisplayMatching(
+    const gfx::Rect& match_rect) const {
+  return GetPrimaryDisplay();
+}
+
+display::Display DesktopScreenWayland::GetPrimaryDisplay() const {
+  DCHECK(!displays_.empty());
+  return displays_.front();
+}
+
+void DesktopScreenWayland::AddObserver(display::DisplayObserver* observer) {
+  change_notifier_.AddObserver(observer);
+}
+
+void DesktopScreenWayland::RemoveObserver(display::DisplayObserver* observer) {
+  change_notifier_.RemoveObserver(observer);
+}
+
+void DesktopScreenWayland::OnOutputSizeChanged(int32_t name,
+    unsigned width, unsigned height) {
+  SetGeometry(name, gfx::Rect(0, 0, width, height));
+}
+
+}  // namespace views