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..f6d6a96d1e03077dcb0adf3bdc3ce429a95c677e 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 (same order) with WallpaperLayout enum in header file.
+const char* kWallpaperLayoutArrays[] = {
+    "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(kWallpaperLayoutArrays);
 const int kDefaultWallpaperCount = arraysize(kDefaultWallpapers);
 const int kInvalidWallpaperIndex = -1;
 const int kSolidColorIndex = -2;
@@ -258,6 +267,15 @@ int GetInvalidWallpaperIndex() {
   return kInvalidWallpaperIndex;
 }
 
+WallpaperLayout GetLayoutEnum(const char* layout) {
+  for (int i = 0; i < kWallpaperLayoutCount; i++) {
+    if (strcmp(layout, kWallpaperLayoutArrays[i]) == 0)
+      return static_cast<WallpaperLayout>(i);
+  }
+  // Default to use CENTER layout.
+  return CENTER;
+}
+
 int GetNextWallpaperIndex(int index) {
   DCHECK(kLastRandomWallpaperIndex < kDefaultWallpaperCount);
   return (index + 1) % (kLastRandomWallpaperIndex + 1);