imf: Remove InputMethodBase::sending_key_event.

sending_key_event was used to determine whether a key event is being
sent from the IME extension. However, we already have a property on the
event called kPropertyFromVK that stores this, so we can just remove
sending_key_event.

Bug: 1005619
Change-Id: I5978c16efe83652f6202e80cf0dd6d1b40c76a53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1814586Reviewed-by: Shu Chen <shuchen@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698450}

ui/base/ime/input_method_base.cc

@@ -271,13 +271,11 @@ SurroundingTextInfo InputMethodBase::GetSurroundingTextInfo() {
 }
 
 void InputMethodBase::SendKeyEvent(KeyEvent* event) {
-  sending_key_event_ = true;
   if (track_key_events_for_testing_) {
     key_events_for_testing_.push_back(std::make_unique<KeyEvent>(*event));
   }
   ui::EventDispatchDetails details = DispatchKeyEvent(event);
   DCHECK(!details.dispatcher_destroyed);
-  sending_key_event_ = false;
 }
 
 InputMethod* InputMethodBase::GetInputMethod() {

ui/base/ime/input_method_base.h

@@ -131,16 +131,11 @@ class COMPONENT_EXPORT(UI_BASE_IME) InputMethodBase
   // Gets the bounds of the composition text or cursor in |client|.
   std::vector<gfx::Rect> GetCompositionBounds(const TextInputClient* client);
 
-  bool sending_key_event() const { return sending_key_event_; }
   internal::InputMethodDelegate* delegate() const { return delegate_; }
 
   static IMEEngineHandlerInterface* GetEngine();
 
  private:
-  // Indicates whether the IME extension is currently sending a fake key event.
-  // This is used in SendKeyEvent.
-  bool sending_key_event_ = false;
-
   internal::InputMethodDelegate* delegate_;
 
   // InputMethod:

ui/base/ime/linux/input_method_auralinux.cc

@@ -7,6 +7,7 @@
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/environment.h"
+#include "ui/base/ime/constants.h"
 #include "ui/base/ime/ime_bridge.h"
 #include "ui/base/ime/ime_engine_handler_interface.h"
 #include "ui/base/ime/linux/linux_input_method_context_factory.h"
@@ -56,7 +57,9 @@ ui::EventDispatchDetails InputMethodAuraLinux::DispatchKeyEvent(
   if (!GetTextInputClient())
     return DispatchKeyEventPostIME(event);
 
-  if (!event->HasNativeEvent() && sending_key_event()) {
+  auto* properties = event->properties();
+  if (!event->HasNativeEvent() && properties &&
+      properties->find(ui::kPropertyFromVK) != properties->end()) {
     // Faked key events that are sent from input.ime.sendKeyEvents.
     ui::EventDispatchDetails details = DispatchKeyEventPostIME(event);
     if (details.dispatcher_destroyed || details.target_destroyed ||