[Remoting Host] Handle text event characters that are not presented on the keyboard

remoting/host/input_injector_x11.cc

Index: remoting/host/input_injector_x11.cc
diff --git a/remoting/host/input_injector_x11.cc b/remoting/host/input_injector_x11.cc
index 3c9d0a88fe17565532968acb8a2f348e25f0d80d..4738700f5843a7608190bae09dafa8da9b058beb 100644
--- a/remoting/host/input_injector_x11.cc
+++ b/remoting/host/input_injector_x11.cc
@@ -26,6 +26,7 @@
 #include "remoting/host/clipboard.h"
 #include "remoting/host/linux/unicode_to_keysym.h"
 #include "remoting/host/linux/x11_util.h"
+#include "remoting/host/linux/x_server_key_mapper.h"
 #include "remoting/proto/internal.pb.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 #include "ui/events/keycodes/dom/dom_code.h"
@@ -199,6 +200,8 @@ class InputInjectorX11 : public InputInjector {
 
     std::unique_ptr<Clipboard> clipboard_;
 
+    std::unique_ptr<XServerKeyMapper> key_mapper_;
+
     bool saved_auto_repeat_enabled_;
 
     DISALLOW_COPY_AND_ASSIGN(Core);
@@ -367,8 +370,14 @@ void InputInjectorX11::Core::InjectTextEvent(const TextEvent& event) {
 
     uint32_t keycode;
     uint32_t modifiers;
-    if (!FindKeycodeForUnicode(display_, code_point, &keycode, &modifiers))
-      continue;
+    if (!FindKeycodeForUnicode(display_, code_point, &keycode, &modifiers)) {
+      int result = key_mapper_->AddNewCharacter(code_point);

[Sergey Ulanov, 2016/09/19 21:39:00]

Does this work well when you inject a string of characters not present on the
keyboard and the number of characters is higher than the number of keys we can
modify. The receiving application may process the events later, after the layout
is changed again, and as result incorrect character gets injected. To workaround
this we need to ensure that each key character doesn't get changed for certain
time after the key is injected (e.g. 100ms). And then here we would queue key
events to be injected in the future when keys are available.

[Yuwei, 2016/09/21 03:47:40]

Done.

+      if (result < 0) {
+        continue;
+      }
+      keycode = result;
+      modifiers = 0;
+    }
 
     XkbLockModifiers(display_, XkbUseCoreKbd,  modifiers, modifiers);
 
@@ -634,6 +643,8 @@ void InputInjectorX11::Core::Start(
   InitMouseButtonMap();
 
   clipboard_->Start(std::move(client_clipboard));
+
+  key_mapper_.reset(new XServerKeyMapper(display_));
 }
 
 void InputInjectorX11::Core::Stop() {
@@ -643,6 +654,7 @@ void InputInjectorX11::Core::Stop() {
   }
 
   clipboard_.reset();
+  key_mapper_.reset();
 }
 
 }  // namespace