First pass at NNTP theming....

chrome/browser/browser_theme_provider.h

Index: chrome/browser/browser_theme_provider.h
===================================================================
--- chrome/browser/browser_theme_provider.h	(revision 21313)
+++ chrome/browser/browser_theme_provider.h	(working copy)
@@ -57,6 +57,7 @@
   // Strings used by themes to identify miscellaneous numerical properties.
   static const char* kDisplayPropertyNTPAlignment;
   static const char* kDisplayPropertyNTPTiling;
+  static const char* kDisplayPropertyNTPInverseLogo;
 
   // Strings used in alignment properties.
   static const char* kAlignmentTop;
@@ -123,7 +124,8 @@
     TINT_FRAME_INCOGNITO_INACTIVE,
     TINT_BACKGROUND_TAB,
     NTP_BACKGROUND_ALIGNMENT,
-    NTP_BACKGROUND_TILING
+    NTP_BACKGROUND_TILING,
+    NTP_LOGO_ALTERNATE
   };
 
   // A bitfield mask for alignments.
@@ -197,6 +199,10 @@
   // will be stored in our cache.
   void GenerateFrameImages();
 
+  // Generate any tab images that weren't specified. The resulting images
+  // will be stored in our cache.
+  void GenerateTabImages();
+
   // Clears all the override fields and saves the dictionary.
   void ClearAllThemeData();