Implement a runtime headless mode for Linux

headless/lib/browser/headless_window_tree_host.cc

Index: headless/lib/browser/headless_window_tree_host.cc
diff --git a/headless/lib/browser/headless_window_tree_host.cc b/headless/lib/browser/headless_window_tree_host.cc
new file mode 100644
index 0000000000000000000000000000000000000000..96cec1a96e69b017d71a78010989d9fc01685a75
--- /dev/null
+++ b/headless/lib/browser/headless_window_tree_host.cc
@@ -0,0 +1,75 @@
+// 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 "headless/lib/browser/headless_window_tree_host.h"
+
+#include "ui/gfx/icc_profile.h"
+
+namespace headless {
+
+HeadlessWindowTreeHost::HeadlessWindowTreeHost(const gfx::Rect& bounds)
+    : bounds_(bounds) {
+  CreateCompositor();
+  OnAcceleratedWidgetAvailable();
+}
+
+HeadlessWindowTreeHost::~HeadlessWindowTreeHost() {
+  DestroyCompositor();
+  DestroyDispatcher();
+}
+
+bool HeadlessWindowTreeHost::CanDispatchEvent(const ui::PlatformEvent& event) {
+  return false;
+}
+
+uint32_t HeadlessWindowTreeHost::DispatchEvent(const ui::PlatformEvent& event) {
+  return 0;
+}
+
+ui::EventSource* HeadlessWindowTreeHost::GetEventSource() {
+  return this;
+}
+
+gfx::AcceleratedWidget HeadlessWindowTreeHost::GetAcceleratedWidget() {
+  return gfx::AcceleratedWidget();
+}
+
+gfx::Rect HeadlessWindowTreeHost::GetBoundsInPixels() const {
+  return bounds_;
+}
+
+void HeadlessWindowTreeHost::SetBoundsInPixels(const gfx::Rect& bounds) {
+  bool origin_changed = bounds_.origin() != bounds.origin();
+  bool size_changed = bounds_.size() != bounds.size();
+  bounds_ = bounds;
+  if (origin_changed)
+    OnHostMovedInPixels(bounds.origin());
+  if (size_changed)
+    OnHostResizedInPixels(bounds.size());
+}
+
+void HeadlessWindowTreeHost::ShowImpl() {}
+
+void HeadlessWindowTreeHost::HideImpl() {}
+
+gfx::Point HeadlessWindowTreeHost::GetLocationOnScreenInPixels() const {
+  return gfx::Point();
+}
+
+void HeadlessWindowTreeHost::SetCapture() {}
+
+void HeadlessWindowTreeHost::ReleaseCapture() {}
+
+void HeadlessWindowTreeHost::SetCursorNative(gfx::NativeCursor cursor_type) {}
+
+void HeadlessWindowTreeHost::MoveCursorToScreenLocationInPixels(
+    const gfx::Point& location) {}
+
+void HeadlessWindowTreeHost::OnCursorVisibilityChangedNative(bool show) {}
+
+gfx::ICCProfile HeadlessWindowTreeHost::GetICCProfileForCurrentDisplay() {
+  return gfx::ICCProfile();
+}
+
+}  // namespace headless