IME (input method editor) support for Aura, part 3 of 3: Use ui::InputMethod in ash.

ui/aura_shell/shell.cc

Index: ui/aura_shell/shell.cc
diff --git a/ui/aura_shell/shell.cc b/ui/aura_shell/shell.cc
index 087a3155b9fcebe242b43da00c57b777aa2182e3..100f2e9250ab5874f8836fca78130a56e3bb4007 100644
--- a/ui/aura_shell/shell.cc
+++ b/ui/aura_shell/shell.cc
@@ -9,7 +9,9 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "ui/aura/root_window.h"
+#include "ui/aura/client/aura_constants.h"
 #include "ui/aura/layout_manager.h"
+#include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/aura_shell/activation_controller.h"
 #include "ui/aura_shell/app_list.h"
@@ -18,11 +20,12 @@
 #include "ui/aura_shell/compact_status_area_layout_manager.h"
 #include "ui/aura_shell/default_container_event_filter.h"
 #include "ui/aura_shell/default_container_layout_manager.h"
-#include "ui/aura_shell/root_window_event_filter.h"
-#include "ui/aura_shell/root_window_layout_manager.h"
 #include "ui/aura_shell/drag_drop_controller.h"
+#include "ui/aura_shell/input_method_event_filter.h"
 #include "ui/aura_shell/launcher/launcher.h"
 #include "ui/aura_shell/modal_container_layout_manager.h"
+#include "ui/aura_shell/root_window_event_filter.h"
+#include "ui/aura_shell/root_window_layout_manager.h"
 #include "ui/aura_shell/shadow_controller.h"
 #include "ui/aura_shell/shelf_layout_manager.h"
 #include "ui/aura_shell/shell_accelerator_controller.h"
@@ -125,6 +128,7 @@ Shell::Shell(ShellDelegate* delegate)
 }
 
 Shell::~Shell() {
+  RemoveRootWindowEventFilter(input_method_filter_.get());
   RemoveRootWindowEventFilter(accelerator_filter_.get());
 
   // TooltipController needs a valid shell instance. We delete it before
@@ -200,6 +204,12 @@ void Shell::Init() {
   // Force a layout.
   root_window->layout_manager()->OnWindowResized();
 
+  // Initialize InputMethodEventFilter. The filter must be added first since it
+  // has the highest priority.
+  DCHECK(!GetRootWindowEventFilterCount());
+  input_method_filter_.reset(new internal::InputMethodEventFilter);
+  AddRootWindowEventFilter(input_method_filter_.get());
+
   // Initialize ShellAcceleratorFilter
   accelerator_filter_.reset(new internal::ShellAcceleratorFilter);
   AddRootWindowEventFilter(accelerator_filter_.get());
@@ -285,6 +295,11 @@ void Shell::RemoveRootWindowEventFilter(aura::EventFilter* filter) {
       aura::RootWindow::GetInstance()->event_filter())->RemoveFilter(filter);
 }
 
+size_t Shell::GetRootWindowEventFilterCount() const {
+  return static_cast<internal::RootWindowEventFilter*>(
+      aura::RootWindow::GetInstance()->event_filter())->GetFilterCount();
+}
+
 void Shell::ToggleOverview() {
   if (workspace_controller_.get())
     workspace_controller_->ToggleOverview();