Add SetProminent() to MdTextButton to create blue buttons.

ui/native_theme/common_theme.cc

Index: ui/native_theme/common_theme.cc
diff --git a/ui/native_theme/common_theme.cc b/ui/native_theme/common_theme.cc
index 71af8db44798ad6eb93d8815ce6e2b3ca8dde331..a0ca2e74767e790b1157a0f6213fee87a031c895 100644
--- a/ui/native_theme/common_theme.cc
+++ b/ui/native_theme/common_theme.cc
@@ -159,8 +159,8 @@ SkColor GetAuraColor(NativeTheme::ColorId color_id,
   static const SkColor kBlueButtonPressedColor = SK_ColorWHITE;
   static const SkColor kBlueButtonHoverColor = SK_ColorWHITE;
   static const SkColor kBlueButtonShadowColor = SkColorSetRGB(0x53, 0x8C, 0xEA);
-  static const SkColor kCallToActionColor = gfx::kGoogleBlue500;
-  static const SkColor kTextOnCallToActionColor = SK_ColorWHITE;
+  static const SkColor kProminentButtonColor = gfx::kGoogleBlue500;
+  static const SkColor kTextOnProminentButtonColor = SK_ColorWHITE;

[sky, 2016/09/27 17:38:32]

generally the 'Text' qualifier is later in the constant, e.g. kTooltipTextColor,
kColorId_ResultsTableSelectedText. How about kProminentButtonTextColor?

[shrike, 2016/09/27 17:52:51]

kProminentButtonTextColor is good. The convention wasn't clear (given that
kTextOnCallToActionColor was OKed), so I wasn't sure how people felt about
kProminentButtonTextColor. I have made this change.

   static const SkColor kButtonPressedShade = SK_ColorTRANSPARENT;
   // MenuItem:
   static const SkColor kMenuBackgroundColor = SK_ColorWHITE;
@@ -294,10 +294,10 @@ SkColor GetAuraColor(NativeTheme::ColorId color_id,
       return kBlueButtonHoverColor;
     case NativeTheme::kColorId_BlueButtonShadowColor:
       return kBlueButtonShadowColor;
-    case NativeTheme::kColorId_CallToActionColor:
-      return kCallToActionColor;
-    case NativeTheme::kColorId_TextOnCallToActionColor:
-      return kTextOnCallToActionColor;
+    case NativeTheme::kColorId_ProminentButtonColor:
+      return kProminentButtonColor;
+    case NativeTheme::kColorId_TextOnProminentButtonColor:
+      return kTextOnProminentButtonColor;
     case NativeTheme::kColorId_ButtonPressedShade:
       return kButtonPressedShade;