[Experimental, WIP] Demo version of extracting WebView selection data from CompositorFrame.

content/browser/browser_plugin/browser_plugin_guest.cc

Index: content/browser/browser_plugin/browser_plugin_guest.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest.cc b/content/browser/browser_plugin/browser_plugin_guest.cc
index 22696314621b4af82d931e56373010603b803114..d17745f40fd60000d7f1e34e47f55c5d9a6cdb83 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest.cc
@@ -38,6 +38,7 @@
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/drop_data.h"
+#include "ui/gfx/geometry/point_conversions.h"
 #include "ui/gfx/geometry/size_conversions.h"
 
 #if defined(OS_MACOSX)
@@ -453,10 +454,16 @@ WebContentsImpl* BrowserPluginGuest::GetWebContents() const {
 
 gfx::Point BrowserPluginGuest::GetScreenCoordinates(
     const gfx::Point& relative_position) const {
+  return gfx::ToRoundedPoint(
+      GetScreenCoordinates(gfx::PointF(relative_position)));
+}
+
+gfx::PointF BrowserPluginGuest::GetScreenCoordinates(
+    const gfx::PointF& relative_position) const {
   if (!attached())
     return relative_position;
 
-  gfx::Point screen_pos(relative_position);
+  gfx::PointF screen_pos(relative_position);
   screen_pos += guest_window_rect_.OffsetFromOrigin();
   if (embedder_web_contents()->GetBrowserPluginGuest()) {
      BrowserPluginGuest* embedder_guest =
@@ -465,7 +472,6 @@ gfx::Point BrowserPluginGuest::GetScreenCoordinates(
   }
   return screen_pos;
 }
-
 void BrowserPluginGuest::SendMessageToEmbedder(IPC::Message* msg) {
   if (!attached()) {
     // Some pages such as data URLs, javascript URLs, and about:blank