alternate ntp: implement searchbox api for instant overlay to adopt themes

chrome/common/instant_types.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_COMMON_INSTANT_TYPES_H_
 #define CHROME_COMMON_INSTANT_TYPES_H_
 
+#include <string>
+
 #include "base/string16.h"
 #include "googleurl/src/gurl.h"
 
 // Ways that the Instant suggested text is autocompleted into the omnibox.
 enum InstantCompleteBehavior {
   // Autocomplete the suggestion immediately.
   INSTANT_COMPLETE_NOW,
 
   // Do not autocomplete the suggestion. The suggestion may still be displayed
   // in the omnibox, but not made a part of the omnibox text by default (e.g.,
@@ skipping 68 matching lines @@
 
   // Query suggestions and search results relevant when the user is typing in
   // the omnibox.
   INSTANT_SHOWN_QUERY_SUGGESTIONS,
 
   // ZeroSuggest suggestions relevant when the user has focused in the omnibox,
   // but not yet typed anything.
   INSTANT_SHOWN_ZERO_SUGGESTIONS,
 };
 
+// Specifies information required for NTP Instant overlay to adopt the browser's
+// theme.
+struct ThemeBackgroundInfo {
+  ThemeBackgroundInfo();
+  ~ThemeBackgroundInfo();
+
+  // The theme background color in RGBA format where the R, G, B and A values
+  // are between 0 and 255 inclusive and always valid.
+  int color_r;
+  int color_g;
+  int color_b;
+  int color_a;

[palmer, 2012/11/19 22:23:20]

Wasn't A supposed to be a double between 0 and 1? (Having it be an int or a
double is fine by me for security purposes, of course. Do whatever works.)

[kuan, 2012/11/20 00:12:44]

the original type is an int, which i convert to double when i format the string.

+
+  // The theme id for the theme background image.
+  // Value is only valid if there's a custom theme background image.
+  std::string theme_id;
+
+  // The theme background image alignment is only valid if |theme_id| is valid.
+  int image_alignment;
+
+  // The theme background image tiling is only valid if |theme_id| is valid.
+  int image_tiling;
+
+  // The theme background image height.
+  // Value is only valid if |theme_id| is valid.
+  uint16 image_height;
+};
+
 #endif  // CHROME_COMMON_INSTANT_TYPES_H_