Ensure that the extension icons show up in the omnibox at fractional scales.

ui/base/layout.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/layout.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 
@@ skipping 74 matching lines @@
   return gfx::GetDPIScale();
 #else
   return GetScaleForScaleFactor(scale_factor);
 #endif
 }
 
 float GetScaleForScaleFactor(ScaleFactor scale_factor) {
   return kScaleFactorScales[scale_factor];
 }
 
+bool IsSupportedScale(float scale) {
+  for (auto scale_factor_idx : *g_supported_scale_factors) {
+    if (kScaleFactorScales[scale_factor_idx] == scale)
+      return true;
+  }
+  return false;
+}
+
 namespace test {
 
 ScopedSetSupportedScaleFactors::ScopedSetSupportedScaleFactors(
     const std::vector<ui::ScaleFactor>& new_scale_factors) {
   if (g_supported_scale_factors) {
     original_scale_factors_ =
         new std::vector<ScaleFactor>(*g_supported_scale_factors);
   } else {
     original_scale_factors_ = NULL;
   }
@@ skipping 14 matching lines @@
 
 #if !defined(OS_MACOSX)
 float GetScaleFactorForNativeView(gfx::NativeView view) {
   gfx::Screen* screen = gfx::Screen::GetScreenFor(view);
   gfx::Display display = screen->GetDisplayNearestWindow(view);
   return display.device_scale_factor();
 }
 #endif  // !defined(OS_MACOSX)
 
 }  // namespace ui