Desktop Aura: Allow tab drags out of window.

You can now drag tabs in and out of windows in linux_aura builds. This patch has a lot of moving parts and caveats though.

Moving parts in the patch:
- Added system location to aura::Events.
- Forwarding move events from RootWindowHostLinux to the TabDragController through an observer.
- MessagePumpAuraX11 now can block waiting for a window to be mapped. If we don't do this, we can't perform a grab on the new window.
- The drag offset is threaded from TabDragController through the WindowMoveController interface. (There's no other non-racey way of getting this data locally from X.)
- RootWindowHostLinux now has working Show()/Hide().

TODOs:
- After releasing a new window, the window looks focused, but isn't. You have to click on it for it to receive input focus.

BUG=133059
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10828133

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152180 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 23 insertions, 0 deletions

diff --git a/base/message_pump_aurax11.cc b/base/message_pump_aurax11.cc
index 10f95cb..7f47fa6 100644
--- a/base/message_pump_aurax11.cc
+++ b/base/message_pump_aurax11.cc
@@ -139,6 +139,12 @@ void MessagePumpAuraX11::SetDefaultDispatcher(
   g_default_dispatcher = dispatcher;
 }
 
+// static
+MessagePumpAuraX11* MessagePumpAuraX11::Current() {
+  MessageLoopForUI* loop = MessageLoopForUI::current();
+  return static_cast<MessagePumpAuraX11*>(loop->pump_ui());
+}
+
 bool MessagePumpAuraX11::DispatchXEvents() {
   Display* display = GetDefaultXDisplay();
   DCHECK(display);
@@ -156,6 +162,23 @@ bool MessagePumpAuraX11::DispatchXEvents() {
   return TRUE;
 }
 
+void MessagePumpAuraX11::BlockUntilWindowMapped(unsigned long window) {
+  XEvent event;
+
+  Display* display = GetDefaultXDisplay();
+  DCHECK(display);
+
+  MessagePumpDispatcher* dispatcher =
+      GetDispatcher() ? GetDispatcher() : g_default_dispatcher;
+
+  do {
+    // Block until there's a message of |event_mask| type on |w|. Then remove
+    // it from the queue and stuff it in |event|.
+    XWindowEvent(display, window, StructureNotifyMask, &event);
+    ProcessXEvent(dispatcher, &event);
+  } while (event.type != MapNotify);
+}
+
 MessagePumpAuraX11::~MessagePumpAuraX11() {
   g_source_destroy(x_source_);
   g_source_unref(x_source_);