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

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index e09bf33cdb434d959f8980dd36dd4a34b176020f..5a92cb68bde5d665375c702f8d469d55bb0c1e45 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -1288,6 +1288,11 @@ gfx::Rect RenderWidgetHostViewAura::ConvertRectFromScreen(
   return rect;
 }
 
+float RenderWidgetHostViewAura::GetScaleFactor() const {
+  return display::Screen::GetScreen()
+      ->GetDisplayNearestWindow(window_).device_scale_factor();

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

just return |device_scale_factor_|?

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

Ah, I didn't notice that. Thanks for pointing it out.

I've removed the GetScaleFactor method.

+}
+
 gfx::Rect RenderWidgetHostViewAura::GetCaretBounds() const {
   if (!text_input_manager_ || !text_input_manager_->GetActiveWidget())
     return gfx::Rect();