Restore browser windows to correct desktop on Win10 (reland)

This is a reland of crrev.com/c/1559168, with a fix for the issue restoring
windows after minimize (crbug.com/952142).

Bug: 873414,952142
Change-Id: I421c1334396c9525dc121d2e98864b7bf1b691a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1570246Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652670}

chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.cc

@@ -11,6 +11,7 @@
 
 #include "base/macros.h"
 #include "base/process/process_handle.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/win/windows_version.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/themes/theme_service.h"
@@ -41,8 +42,7 @@ BrowserDesktopWindowTreeHostWin::BrowserDesktopWindowTreeHostWin(
       browser_view_(browser_view),
       browser_frame_(browser_frame) {}
 
-BrowserDesktopWindowTreeHostWin::~BrowserDesktopWindowTreeHostWin() {
-}
+BrowserDesktopWindowTreeHostWin::~BrowserDesktopWindowTreeHostWin() {}
 
 views::NativeMenuWin* BrowserDesktopWindowTreeHostWin::GetSystemMenu() {
   if (!system_menu_.get()) {
@@ -74,6 +74,52 @@ bool BrowserDesktopWindowTreeHostWin::UsesNativeSystemMenu() const {
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserDesktopWindowTreeHostWin, views::DesktopWindowTreeHostWin overrides:
 
+void BrowserDesktopWindowTreeHostWin::Init(
+    const views::Widget::InitParams& params) {
+  DesktopWindowTreeHostWin::Init(params);
+  if (base::win::GetVersion() < base::win::VERSION_WIN10)
+    return;  // VirtualDesktopManager isn't support pre Win-10.
+
+  CHECK(SUCCEEDED(::CoCreateInstance(__uuidof(VirtualDesktopManager), nullptr,
+                                     CLSCTX_ALL,
+                                     IID_PPV_ARGS(&virtual_desktop_manager_))));
+
+  if (!params.workspace.empty()) {
+    GUID guid = GUID_NULL;
+    HRESULT hr =
+        CLSIDFromString(base::UTF8ToUTF16(params.workspace).c_str(), &guid);
+    if (SUCCEEDED(hr)) {
+      // There are valid reasons MoveWindowToDesktop can fail, e.g.,
+      // the desktop was deleted. If it fails, the window will open on the
+      // current desktop.
+      virtual_desktop_manager_->MoveWindowToDesktop(GetHWND(), guid);
+    }
+  }
+  // This will force the window to re-open in this desktop on restart.
+  // We always want to do this even if |params.workspace| is empty, to handle
+  // the case of new windows.
+  OnHostWorkspaceChanged();
+}
+
+std::string BrowserDesktopWindowTreeHostWin::GetWorkspace() const {
+  std::string workspace_id;
+  if (virtual_desktop_manager_) {
+    GUID workspace_guid;
+    HRESULT hr = virtual_desktop_manager_->GetWindowDesktopId(GetHWND(),
+                                                              &workspace_guid);
+    if (SUCCEEDED(hr)) {
+      LPOLESTR workspace_widestr;
+      StringFromCLSID(workspace_guid, &workspace_widestr);
+      workspace_id = base::WideToUTF8(workspace_widestr);
+      workspace_ = workspace_id;
+      CoTaskMemFree(workspace_widestr);
+    } else {
+      return workspace_.value_or("");
+    }
+  }
+  return workspace_id;
+}
+
 int BrowserDesktopWindowTreeHostWin::GetInitialShowState() const {
   STARTUPINFO si = {0};
   si.cb = sizeof(si);
@@ -195,6 +241,13 @@ void BrowserDesktopWindowTreeHostWin::PostHandleMSG(UINT message,
                                                     WPARAM w_param,
                                                     LPARAM l_param) {
   switch (message) {
+    case WM_SETFOCUS: {
+      // GetWorkspace sets |workspace_|, so stash prev value.
+      std::string prev_workspace = workspace_.value_or("");
+      if (prev_workspace != GetWorkspace())
+        OnHostWorkspaceChanged();
+      break;
+    }
     case WM_CREATE:
       minimize_button_metrics_.Init(GetHWND());
       break;
@@ -300,6 +353,5 @@ BrowserDesktopWindowTreeHost*
         BrowserFrame* browser_frame) {
   return new BrowserDesktopWindowTreeHostWin(native_widget_delegate,
                                              desktop_native_widget_aura,
-                                             browser_view,
-                                             browser_frame);
+                                             browser_view, browser_frame);
 }

chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.h

@@ -5,6 +5,9 @@
 #ifndef CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_WINDOW_TREE_HOST_WIN_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_WINDOW_TREE_HOST_WIN_H_
 
+#include <shobjidl.h>
+#include <wrl/client.h>
+
 #include "base/macros.h"
 #include "chrome/browser/ui/views/frame/browser_desktop_window_tree_host.h"
 #include "chrome/browser/ui/views/frame/minimize_button_metrics_win.h"
@@ -38,6 +41,8 @@ class BrowserDesktopWindowTreeHostWin : public BrowserDesktopWindowTreeHost,
   bool UsesNativeSystemMenu() const override;
 
   // Overridden from DesktopWindowTreeHostWin:
+  void Init(const views::Widget::InitParams& params) override;
+  std::string GetWorkspace() const override;
   int GetInitialShowState() const override;
   bool GetClientAreaInsets(gfx::Insets* insets,
                            HMONITOR monitor) const override;
@@ -68,6 +73,16 @@ class BrowserDesktopWindowTreeHostWin : public BrowserDesktopWindowTreeHost,
   // The wrapped system menu itself.
   std::unique_ptr<views::NativeMenuWin> system_menu_;
 
+  // On Windows10, this is the virtual desktop the browser window was on,
+  // last we checked. This is used to tell if the window has moved to a
+  // different desktop, and notify listeners. It will only be set if
+  // we created |virtual_desktop_manager_|.
+  mutable base::Optional<std::string> workspace_;
+
+  // Only set on Windows10. Set by GetOrCreateVirtualDesktopManager().
+  mutable Microsoft::WRL::ComPtr<IVirtualDesktopManager>
+      virtual_desktop_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserDesktopWindowTreeHostWin);
 };