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

ui/base/layout.cc

Index: ui/base/layout.cc
diff --git a/ui/base/layout.cc b/ui/base/layout.cc
index 5aaa7aa4e0006ec99b5b4791f631bb13b99b157b..e49c24bed9b7802c22dd0776e3e956e8997d5f4a 100644
--- a/ui/base/layout.cc
+++ b/ui/base/layout.cc
@@ -92,6 +92,14 @@ 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(