Allow one-copy task tile worker pool to use compressed textures.

cc/resources/platform_color.h

Index: cc/resources/platform_color.h
diff --git a/cc/resources/platform_color.h b/cc/resources/platform_color.h
index 17eddc1faa7552fde72ce800d2d636bc524e86e2..7e498635b2b8a73a020947753ad7752c0a4a4e8b 100644
--- a/cc/resources/platform_color.h
+++ b/cc/resources/platform_color.h
@@ -24,7 +24,19 @@ class PlatformColor {
   }
 
   // Returns the most efficient texture format for this platform.
-  static ResourceFormat BestTextureFormat(bool supports_bgra8888) {
+  static ResourceFormat BestTextureFormat() {
+    switch (Format()) {
+      case SOURCE_FORMAT_BGRA8:
+        return BGRA_8888;
+      case SOURCE_FORMAT_RGBA8:
+        return RGBA_8888;
+    }
+    NOTREACHED();
+    return RGBA_8888;
+  }
+
+  // Returns the most efficient supported texture format for this platform.
+  static ResourceFormat BestSupportedTextureFormat(bool supports_bgra8888) {
     switch (Format()) {
       case SOURCE_FORMAT_BGRA8:
         return (supports_bgra8888) ? BGRA_8888 : RGBA_8888;