Add 1.6x mode.

ui/display/manager/display_manager_utilities.cc

Index: ui/display/manager/display_manager_utilities.cc
diff --git a/ui/display/manager/display_manager_utilities.cc b/ui/display/manager/display_manager_utilities.cc
index c84c1066f293cf73bcd806875a7898c22b66a938..7f5737c108d64bd6c53e6b163c58c06efef7b11c 100644
--- a/ui/display/manager/display_manager_utilities.cc
+++ b/ui/display/manager/display_manager_utilities.cc
@@ -23,14 +23,19 @@ namespace {
 constexpr float kUIScalesFor2x[] = {0.5f,   0.625f, 0.8f, 1.0f,
                                     1.125f, 1.25f,  1.5f, 2.0f};
 constexpr float kUIScalesFor1_25x[] = {0.5f, 0.625f, 0.8f, 1.0f, 1.25f};
+constexpr float kUIScalesFor1_6x[] = {0.5f, 0.8f, 1.0f, 1.2f, 1.6f};
+
 constexpr float kUIScalesFor1280[] = {0.5f, 0.625f, 0.8f, 1.0f, 1.125f};
 constexpr float kUIScalesFor1366[] = {0.5f, 0.6f, 0.75f, 1.0f, 1.125f};
+constexpr float kUIScalesForFHD[] = {0.5f, 0.625f, 0.8f, 1.0f, 1.25f};
 
 // The default UI scales for the above display densities.
 constexpr float kDefaultUIScaleFor2x = 1.0f;
 constexpr float kDefaultUIScaleFor1_25x = 0.8f;
+constexpr float kDefaultUIScaleFor1_6x = 1.0f;
 constexpr float kDefaultUIScaleFor1280 = 1.0f;
 constexpr float kDefaultUIScaleFor1366 = 1.0f;
+constexpr float kDefaultUIScaleForFHD = 1.0f;
 
 // Encapsulates the list of UI scales and the default one.
 struct DisplayUIScales {
@@ -51,6 +56,10 @@ DisplayUIScales GetScalesForDisplay(
     ASSIGN_ARRAY(ret.scales, kUIScalesFor1_25x);
     ret.default_scale = kDefaultUIScaleFor1_25x;
     return ret;
+  } else if (native_mode->device_scale_factor() == 1.6f) {
+    ASSIGN_ARRAY(ret.scales, kUIScalesFor1_6x);
+    ret.default_scale = kDefaultUIScaleFor1_6x;
+    return ret;
   }
   switch (native_mode->size().width()) {
     case 1280:
@@ -61,6 +70,10 @@ DisplayUIScales GetScalesForDisplay(
       ASSIGN_ARRAY(ret.scales, kUIScalesFor1366);
       ret.default_scale = kDefaultUIScaleFor1366;
       break;
+    case 1980:
+      ASSIGN_ARRAY(ret.scales, kUIScalesForFHD);
+      ret.default_scale = kDefaultUIScaleForFHD;
+      break;
     default:
       ASSIGN_ARRAY(ret.scales, kUIScalesFor1280);
       ret.default_scale = kDefaultUIScaleFor1280;