Replace agg with skia

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 9ecd70830e27f2d220bebcbe05bf7bed6beede93..29d2a0b5b30cfdf4eac4f8e7d87ea4e47fb13284 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-pdf_use_skia = false
-
 config("pdfium_config") {
   cflags = []
   defines = [
@@ -13,10 +11,6 @@ config("pdfium_config") {
     "_NO_GDIPLUS_",  # workaround text rendering issues on Windows
   ]
 
-  if (pdf_use_skia) {
-    defines += [ "_SKIA_SUPPORT_" ]
-  }
-
   if (is_linux) {
     if (cpu_arch == "x64") {
       defines += [ "_FX_CPU_=_FX_X64_" ]
@@ -553,23 +547,6 @@ static_library("fxge") {
     "core/include/fxge/fx_ge.h",
     "core/include/fxge/fx_ge_apple.h",
     "core/include/fxge/fx_ge_win32.h",
-    "core/src/fxge/agg/include/fxfx_agg_basics.h",
-    "core/src/fxge/agg/include/fxfx_agg_clip_liang_barsky.h",
-    "core/src/fxge/agg/include/fxfx_agg_conv_dash.h",
-    "core/src/fxge/agg/include/fxfx_agg_conv_stroke.h",
-    "core/src/fxge/agg/include/fxfx_agg_curves.h",
-    "core/src/fxge/agg/include/fxfx_agg_path_storage.h",
-    "core/src/fxge/agg/include/fxfx_agg_rasterizer_scanline_aa.h",
-    "core/src/fxge/agg/include/fxfx_agg_renderer_scanline.h",
-    "core/src/fxge/agg/include/fxfx_agg_rendering_buffer.h",
-    "core/src/fxge/agg/include/fxfx_agg_scanline_u.h",
-    "core/src/fxge/agg/include/fx_agg_driver.h",
-    "core/src/fxge/agg/src/fxfx_agg_curves.cpp",
-    "core/src/fxge/agg/src/fxfx_agg_driver.cpp",
-    "core/src/fxge/agg/src/fxfx_agg_path_storage.cpp",
-    "core/src/fxge/agg/src/fxfx_agg_rasterizer_scanline_aa.cpp",
-    "core/src/fxge/agg/src/fxfx_agg_vcgen_dash.cpp",
-    "core/src/fxge/agg/src/fxfx_agg_vcgen_stroke.cpp",
     "core/src/fxge/android/fpf_skiafont.cpp",
     "core/src/fxge/android/fpf_skiafont.h",
     "core/src/fxge/android/fpf_skiafontmgr.cpp",
@@ -643,6 +620,8 @@ static_library("fxge") {
     "core/src/fxge/ge/fx_ge_ps.cpp",
     "core/src/fxge/ge/fx_ge_text.cpp",
     "core/src/fxge/ge/text_int.h",
+    "core/src/fxge/skia/fx_skia_blitter.cpp",
+    "core/src/fxge/skia/fx_skia_driver.cpp",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
@@ -651,23 +630,7 @@ static_library("fxge") {
   }
   configs += [ ":pdfium_config", "//build/config/compiler:no_chromium_code" ]
 
-  if (pdf_use_skia) {
-    sources = [
-      "core/src/fxge/skia/fx_skia_blitter_new.cpp",
-      "core/src/fxge/skia/fx_skia_device.cpp",
-    ]
-    include_dirs = [
-      "//third_party/skia/include/config",
-      "//third_party/skia/include/core",
-      "//third_party/skia/include/effects",
-      "//third_party/skia/include/images",
-      "//third_party/skia/include/lazy",
-      "//third_party/skia/include/pathops",
-      "//third_party/skia/include/utils",
-      "//third_party/skia/src/core",
-    ]
-    deps = [ "//skia" ]
-  }
+  deps = [ "//skia" ]
 
   if (is_win) {
     sources += [