[MD] Implement incognito colors as a NativeTheme (for Aura).

ui/gfx/color_palette.h

Index: ui/gfx/color_palette.h
diff --git a/ui/gfx/color_palette.h b/ui/gfx/color_palette.h
index 372f52c8558761e8952bc4a90d4bb9a33658eaa0..f39e443792246030dcfafe692578c3201f23380a 100644
--- a/ui/gfx/color_palette.h
+++ b/ui/gfx/color_palette.h
@@ -9,14 +9,22 @@
 
 namespace gfx {
 
+// A placeholder value for unset colors. This should never be visible and is red
+// as a visual flag for misbehaving code.
+const SkColor kPlaceholderColor = SK_ColorRED;
+
 const SkColor kChromeIconGrey = SkColorSetRGB(0x5A, 0x5A, 0x5A);
 
 // The number refers to the shade of darkness. Each color in the MD
 // palette ranges from 100-900.
 const SkColor kGoogleBlue300 = SkColorSetRGB(0x7B, 0xAA, 0xF7);
 const SkColor kGoogleBlue500 = SkColorSetRGB(0x42, 0x85, 0xF4);
+const SkColor kGoogleBlue700 = SkColorSetRGB(0x33, 0x67, 0xD6);
+const SkColor kGoogleRed300 = SkColorSetRGB(0xE6, 0x7C, 0x73);
 const SkColor kGoogleRed700 = SkColorSetRGB(0xC5, 0x39, 0x29);
+const SkColor kGoogleGreen300 = SkColorSetRGB(0x57, 0xBB, 0x8A);
 const SkColor kGoogleGreen700 = SkColorSetRGB(0x0B, 0x80, 0x43);
+const SkColor kGoogleYellow300 = SkColorSetRGB(0xF7, 0xCB, 0x4D);
 const SkColor kGoogleYellow700 = SkColorSetRGB(0xF0, 0x93, 0x00);
 
 }  // namespace gfx