Implement user selected wallpaper feature.

chrome/browser/ui/webui/options2/chromeos/wallpaper_thumbnail_source2.cc

Index: chrome/browser/ui/webui/options2/chromeos/wallpaper_thumbnail_source2.cc
diff --git a/chrome/browser/ui/webui/options2/chromeos/wallpaper_thumbnail_source2.cc b/chrome/browser/ui/webui/options2/chromeos/wallpaper_thumbnail_source2.cc
index 8186da8b2289512dca0210c72cb4a04f6da38249..860c1898a2a6ce9ca70dbd2dcc6640ef6b9c5641 100644
--- a/chrome/browser/ui/webui/options2/chromeos/wallpaper_thumbnail_source2.cc
+++ b/chrome/browser/ui/webui/options2/chromeos/wallpaper_thumbnail_source2.cc
@@ -12,6 +12,7 @@
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/threading/thread_restrictions.h"
+#include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/io_thread.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 #include "chrome/common/url_constants.h"
@@ -27,6 +28,7 @@ namespace options2 {
 namespace {
 
 const char kDefaultWallpaperPrefix[] = "default_";
+const char kCustomWallpaperPrefix[] = "custom_";
 
 // Parse an integer from |path| and save it to |index|. For example, deafult_20
 // will set |index| to 20.
@@ -51,6 +53,17 @@ int PathToIDR(const std::string& path) {
   return idr;
 }
 
+// True if |path| is a custom wallpaper thumbnail URL and set |email| parsed
+// from |path|.
+// custom url = "custom_|email|?date" where date is current time.
+bool IsCustomWallpaperPath(const std::string& path, std::string& email) {
+  if (!StartsWithASCII(path, kCustomWallpaperPrefix, false))
+    return false;
+  email = path.substr(strlen(kCustomWallpaperPrefix),
+                      path.find_first_of("?") - strlen(kCustomWallpaperPrefix));

[flackr, 2012/05/04 19:06:17]

What if there is no "?"?

[bshe, 2012/05/08 22:22:18]

If the path can pass the first StartsWithASCII check, it should contain a "?" in
the url. But to be more safe, I added extra check as you suggested.

+  return true;
+}
+
 }  // namespace
 
 std::string GetDefaultWallpaperThumbnailURL(int index) {
@@ -78,6 +91,16 @@ WallpaperThumbnailSource::~WallpaperThumbnailSource() {
 void WallpaperThumbnailSource::StartDataRequest(const std::string& path,
                                                 bool is_incognito,
                                                 int request_id) {
+  std::string email;
+  if (IsCustomWallpaperPath(path, email)) {
+    const chromeos::User* user = chromeos::UserManager::Get()->FindUser(email);
+    if (user) {
+      std::vector<unsigned char> data;
+      gfx::PNGCodec::EncodeBGRASkBitmap(user->wallpaper_thumb(), false, &data);
+      SendResponse(request_id, new base::RefCountedBytes(data));
+      return;
+    }
+  }
   int idr = PathToIDR(path);
   if (idr != -1) {
     DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));