Add SK_LEGACY_SURFACE_PROPS to hold out Skia change.

Skia is removing the old display globals. Chromium is the remaining
heavy user of these globals; defining this macro will preserve the
existing behavior until Chromium can be updated to no longer use them.

Change-Id: I509b6333ea39c60e0b0aab1817513f4f895121a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446776Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Ben Wagner <bungeman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813403}

skia/BUILD.gn

@@ -39,7 +39,7 @@ buildflag_header("buildflags") {
 
 # External-facing config for dependent code.
 config("skia_config") {
-  defines = []
+  defines = [ "SK_LEGACY_SURFACE_PROPS"  ]
   include_dirs = [ "//third_party/skia" ]
 
   if (!is_ios) {