Load the resources for max scale factor first.

ui/base/layout.cc

Index: ui/base/layout.cc
diff --git a/ui/base/layout.cc b/ui/base/layout.cc
index 6fef499542c57632fb6afc58a7d821309ce5d193..77e49219b68dfc6dac18dc2122ac8d5dc3a41fca 100644
--- a/ui/base/layout.cc
+++ b/ui/base/layout.cc
@@ -64,7 +64,7 @@ bool UseTouchOptimizedUI() {
 }
 #endif  // defined(OS_WIN)
 
-const float kScaleFactorScales[] = {1.0f, 1.4f, 1.8f, 2.0f};
+const float kScaleFactorScales[] = {1.0f, 1.0f, 1.4f, 1.8f, 2.0f};
 COMPILE_ASSERT(NUM_SCALE_FACTORS == arraysize(kScaleFactorScales),
                kScaleFactorScales_incorrect_size);
 const size_t kScaleFactorScalesLength = arraysize(kScaleFactorScales);
@@ -94,8 +94,12 @@ std::vector<ScaleFactor>& GetSupportedScaleFactorsInternal() {
       supported_scale_factors->push_back(SCALE_FACTOR_140P);
       supported_scale_factors->push_back(SCALE_FACTOR_180P);
     }
-#elif defined(USE_ASH)
-    supported_scale_factors->push_back(SCALE_FACTOR_200P);
+#elif defined(OS_CHROMEOS)
+    // On ChromeOS, we only support 200P on the device that has 200P.
+    if (ResourceBundle::GetSharedInstance().max_scale_factor() ==
+        SCALE_FACTOR_200P) {
+      supported_scale_factors->push_back(SCALE_FACTOR_200P);
+    }
 #endif
     std::sort(supported_scale_factors->begin(),
               supported_scale_factors->end(),
@@ -134,6 +138,7 @@ ScaleFactor GetScaleFactorFromScale(float scale) {
       smallest_diff = diff;
     }
   }
+  DCHECK_NE(closest_match, SCALE_FACTOR_NONE);
   return closest_match;
 }
 
@@ -142,11 +147,7 @@ float GetScaleFactorScale(ScaleFactor scale_factor) {
 }
 
 ScaleFactor GetMaxScaleFactor() {
-#if defined(OS_CHROMEOS)
-  return ResourceBundle::GetSharedInstance().max_scale_factor();
-#else
   return GetSupportedScaleFactorsInternal().back();
-#endif
 }
 
 std::vector<ScaleFactor> GetSupportedScaleFactors() {