Enable MD by default on Windows for Canary/Dev and local builds.

ui/base/material_design/material_design_controller.cc

Index: ui/base/material_design/material_design_controller.cc
diff --git a/ui/base/material_design/material_design_controller.cc b/ui/base/material_design/material_design_controller.cc
index 86685cf5114f2d0db70683e5828e42960227dfe2..bf153e35e166170935fd1a040ef6157b500da4aa 100644
--- a/ui/base/material_design/material_design_controller.cc
+++ b/ui/base/material_design/material_design_controller.cc
@@ -6,6 +6,7 @@
 
 #include "base/command_line.h"
 #include "base/logging.h"
+#include "base/metrics/field_trial.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/ui_base_switches.h"
@@ -26,8 +27,8 @@
 
 namespace ui {
 
+// static
 bool MaterialDesignController::is_mode_initialized_ = false;
-
 MaterialDesignController::Mode MaterialDesignController::mode_ =
     MaterialDesignController::NON_MATERIAL;
 
@@ -35,6 +36,11 @@ bool MaterialDesignController::include_secondary_ui_ = false;
 
 // static
 void MaterialDesignController::Initialize() {
+  InitializeWithDefaultMode(DefaultMode());
+}
+
+// static
+void MaterialDesignController::InitializeWithDefaultMode(Mode mode) {
   TRACE_EVENT0("startup", "MaterialDesignController::InitializeMode");
   CHECK(!is_mode_initialized_);
 #if !defined(ENABLE_TOPCHROME_MD)
@@ -56,7 +62,22 @@ void MaterialDesignController::Initialize() {
                  << "' for command line switch '" << switches::kTopChromeMD
                  << "'.";
     }
-    SetMode(DefaultMode());
+
+    // The field trial value, if any, overrides the provided default mode.
+    constexpr char kMaterialDesignModeFieldTrialName[] = "MaterialDesignMode";
+    constexpr char kNonMaterialGroupName[] = "NonMaterial";
+    constexpr char kMaterialNormalGroupName[] = "MaterialNormal";
+    constexpr char kMaterialHybridGroupName[] = "MaterialHybrid";
+    const std::string group =
+        base::FieldTrialList::FindFullName(kMaterialDesignModeFieldTrialName);
+    if (group == kNonMaterialGroupName)
+      mode = NON_MATERIAL;
+    else if (group == kMaterialNormalGroupName)
+      mode = MATERIAL_NORMAL;
+    else if (group == kMaterialHybridGroupName)
+      mode = MATERIAL_HYBRID;
+
+    SetMode(mode);
   }
 
   include_secondary_ui_ = base::CommandLine::ForCurrentProcess()->HasSwitch(
@@ -81,6 +102,17 @@ bool MaterialDesignController::IsSecondaryUiMaterial() {
 }
 
 // static
+void MaterialDesignController::Uninitialize() {
+  is_mode_initialized_ = false;
+}
+
+// static
+void MaterialDesignController::SetMode(MaterialDesignController::Mode mode) {
+  mode_ = mode;
+  is_mode_initialized_ = true;
+}
+
+// static
 MaterialDesignController::Mode MaterialDesignController::DefaultMode() {
 #if defined(OS_CHROMEOS)
   // If a scan of available devices has already completed, use material-hybrid
@@ -113,22 +145,11 @@ MaterialDesignController::Mode MaterialDesignController::DefaultMode() {
   }
 #endif  // defined(USE_OZONE)
   return MATERIAL_NORMAL;
-#elif defined(OS_LINUX) || defined(OS_MACOSX)
+#elif defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_WIN)
   return MATERIAL_NORMAL;
 #else
   return NON_MATERIAL;
 #endif  // defined(OS_CHROMEOS)
 }
 
-// static
-void MaterialDesignController::Uninitialize() {
-  is_mode_initialized_ = false;
-}
-
-// static
-void MaterialDesignController::SetMode(MaterialDesignController::Mode mode) {
-  mode_ = mode;
-  is_mode_initialized_ = true;
-}
-
 }  // namespace ui