Enable general CSS filters in the software compositor

cc/trees/layer_tree_host_pixeltest_filters.cc

Index: cc/trees/layer_tree_host_pixeltest_filters.cc
diff --git a/cc/trees/layer_tree_host_pixeltest_filters.cc b/cc/trees/layer_tree_host_pixeltest_filters.cc
index 31b2be45ccc87498548f3ca723a77bee18ba8dff..8f2f7ecb59e4c1d4f7577ef5a222c1602afc72fa 100644
--- a/cc/trees/layer_tree_host_pixeltest_filters.cc
+++ b/cc/trees/layer_tree_host_pixeltest_filters.cc
@@ -195,6 +195,10 @@ TEST_F(LayerTreeHostFiltersPixelTest, ImageFilterClipped) {
                background,
                base::FilePath(FILE_PATH_LITERAL(
                    "blue_yellow.png")));
+  RunPixelTest(SOFTWARE_WITH_BITMAP,

[danakj, 2013/10/16 15:48:59]

Can you split this into a _GL and _Software versions of the test? A super class
will help share code. It could just have a static method that takes
GL_WITH_BITMAP or SOFTWARE_WITH_BITMAP as an argument.

[ajuma, 2013/10/16 19:12:07]

Done, though note that the superclass method must be non-static, since it calls
other non-static methods (e.g. CreateSolidColorLayer, RunPixelTest).

+               background,
+               base::FilePath(FILE_PATH_LITERAL(
+                   "blue_yellow.png")));
 }
 
 }  // namespace