Account for device scale factor in automation API bounding boxes.

chrome/renderer/extensions/automation_internal_custom_bindings.cc

Index: chrome/renderer/extensions/automation_internal_custom_bindings.cc
diff --git a/chrome/renderer/extensions/automation_internal_custom_bindings.cc b/chrome/renderer/extensions/automation_internal_custom_bindings.cc
index 225d68d4a01b6a150cdd15c93da95797a0ea6b17..221c166b9f8f63a27b781a7524c0c49ac5cefe25 100644
--- a/chrome/renderer/extensions/automation_internal_custom_bindings.cc
+++ b/chrome/renderer/extensions/automation_internal_custom_bindings.cc
@@ -13,6 +13,7 @@
 #include "base/macros.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/values.h"
+#include "chrome/common/extensions/api/automation_api_constants.h"
 #include "chrome/common/extensions/chrome_extension_messages.h"
 #include "chrome/common/extensions/manifest_handlers/automation.h"
 #include "content/public/renderer/render_frame.h"
@@ -149,6 +150,17 @@ static gfx::Rect ComputeGlobalNodeBounds(TreeCache* cache,
     node = container;
   }
 
+  // All trees other than the desktop tree are scaled by the device
+  // scale factor. Unscale them so they're all in consistent units.
+  if (cache->tree_id != api::automation::kDesktopTreeID) {
+    float scale_factor = cache->owner->context()
+                             ->GetRenderFrame()
+                             ->GetRenderView()
+                             ->GetDeviceScaleFactor();
+    if (scale_factor > 0)
+      bounds.Scale(1.0 / scale_factor);
+  }
+
   return gfx::ToEnclosingRect(bounds);
 }