Re-enable overdraw mode in debugger.

Debugger is the last user of the deprecated SkPaintFilterCanvas
constructor. Stop using it and remove the constructor.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3268

Change-Id: I3e9180d48abdf86cb2c05bd8d95acabcdaa70427
Reviewed-on: https://skia-review.googlesource.com/3268
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 95e7259..7308fa1 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -792,7 +792,6 @@
       "tools/debugger/SkDrawCommand.cpp",
       "tools/debugger/SkJsonWriteBuffer.cpp",
       "tools/debugger/SkObjectParser.cpp",
-      "tools/debugger/SkOverdrawMode.cpp",
       "tools/picture_utils.cpp",
       "tools/random_parse_path.cpp",
       "tools/sk_tool_utils.cpp",
@@ -1027,6 +1026,7 @@
       "tools/skiaserve/urlhandlers/EnableGPUHandler.cpp",
       "tools/skiaserve/urlhandlers/ImgHandler.cpp",
       "tools/skiaserve/urlhandlers/InfoHandler.cpp",
+      "tools/skiaserve/urlhandlers/OverdrawHandler.cpp",
       "tools/skiaserve/urlhandlers/PostHandler.cpp",
       "tools/skiaserve/urlhandlers/QuitHandler.cpp",
       "tools/skiaserve/urlhandlers/RootHandler.cpp",