Wallpaper manager backend APIs

ash/desktop_background/desktop_background_resources.cc

Index: ash/desktop_background/desktop_background_resources.cc
diff --git a/ash/desktop_background/desktop_background_resources.cc b/ash/desktop_background/desktop_background_resources.cc
index 64392e5a2cce00dba41d44f70b0bb701bbbcc5f8..cdae1ff27728e172f0f75133bfa8944e98182fe3 100644
--- a/ash/desktop_background/desktop_background_resources.cc
+++ b/ash/desktop_background/desktop_background_resources.cc
@@ -12,6 +12,14 @@
 
 namespace {
 
+// Keeps in sync with WallpaperLayout enum in header file.
+const std::string kWallpaperLayoutStrings[] = {
+    "CENTER",
+    "CENTER_CROPPED",
+    "STRETCH",
+    "TILE"
+};
+
 const ash::WallpaperInfo kDefaultWallpapers[] = {
 #if !defined(GOOGLE_CHROME_BUILD)
     {
@@ -221,6 +229,7 @@ const ash::WallpaperInfo kDefaultWallpapers[] = {
     },
 };
 
+const int kWallpaperLayoutCount = arraysize(kWallpaperLayoutStrings);
 const int kDefaultWallpaperCount = arraysize(kDefaultWallpapers);
 const int kInvalidWallpaperIndex = -1;
 const int kSolidColorIndex = -2;
@@ -244,6 +253,16 @@ const int kGuestWallpaperIndex = kDefaultWallpaperIndex;
 
 namespace ash {
 
+WallpaperLayout GetLayoutFromString(std::string layout) {
+
+  for (int i = 0; i < kWallpaperLayoutCount; i++) {
+    if (layout == kWallpaperLayoutStrings[i])
+      return static_cast<WallpaperLayout>(i);
+  }
+  // Default to use CENTER layout.
+  return CENTER;
+}
+
 int GetDefaultWallpaperIndex() {
   DCHECK(kDefaultWallpaperIndex < kDefaultWallpaperCount);
   return std::min(kDefaultWallpaperIndex, kDefaultWallpaperCount - 1);