add local caching for skia draws

PDFium assumes the lowest common denominator
and draws many strings and paths that can
be accumulated.

Defer canvas->restore() calls until required
because the clip changed.

Defer text and path draws as long as subsequent
calls concatenate additional data.

Include debugging switch to allow disabling cache
at compile-time while bugs are shaken out.

Review-Url: https://codereview.chromium.org/2064753002

1 files changed, 4 insertions, 0 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 10fe5df332..91348ce185 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1490,6 +1490,10 @@ test("pdfium_unittests") {
       "xfa/fxfa/parser/xfa_utils_imp_unittest.cpp",
     ]
   }
+  if (pdf_use_skia) {
+    sources += [ "core/fxge/skia/fx_skia_device_unittest.cpp" ]
+    deps += [ "//skia" ]
+  }
   if (pdf_enable_v8) {
     sources += [ "fpdfsdk/javascript/public_methods_unittest.cpp" ]
     include_dirs += [