Use the physical-pixel space for native IME on linux platform.

ui/base/ime/input_method_auralinux.cc

Index: ui/base/ime/input_method_auralinux.cc
diff --git a/ui/base/ime/input_method_auralinux.cc b/ui/base/ime/input_method_auralinux.cc
index 31023c35e206dd62bb968d0474123bd8edfe6fb1..cc541f5964d14103c4c0ee2e40d60ed4b84725db 100644
--- a/ui/base/ime/input_method_auralinux.cc
+++ b/ui/base/ime/input_method_auralinux.cc
@@ -12,6 +12,7 @@
 #include "ui/base/ime/linux/linux_input_method_context_factory.h"
 #include "ui/base/ime/text_input_client.h"
 #include "ui/events/event.h"
+#include "ui/gfx/geometry/rect.h"
 
 namespace {
 
@@ -279,7 +280,9 @@ void InputMethodAuraLinux::OnCaretBoundsChanged(const TextInputClient* client) {
   if (!IsTextInputClientFocused(client))
     return;
   NotifyTextInputCaretBoundsChanged(client);
-  context_->SetCursorLocation(GetTextInputClient()->GetCaretBounds());
+  context_->SetCursorLocation(
+      gfx::ScaleToEnclosingRect(client->GetCaretBounds(),
+                                client->GetScaleFactor()));

[sadrul, 2016/12/22 01:30:22]

Can you update the doc [1] to mention that this is in physical-pixel space?
Alternatively, can this remain in DIP space, and the actual code where this is
used [2] does any necessary conversion to pixel-space?

[1]
https://cs.chromium.org/chromium/src/ui/base/ime/linux/linux_input_method_con...
[2]
https://cs.chromium.org/chromium/src/chrome/browser/ui/libgtkui/x11_input_met...

[Shu Chen, 2016/12/22 03:02:27]

I've leveraged [2] and removed the GetScaleFactor method.

 
   if (!IsTextInputTypeNone() && text_input_type_ != TEXT_INPUT_TYPE_PASSWORD &&
       GetEngine())