Allow compiling PDFium without V8.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index f048f9db3c45128c5e1e8b3fb9355afbda201150..8ae5a085f02f9011e69b4579e274a7af7f0fecfa 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -3,14 +3,7 @@
 # found in the LICENSE file.
 
 import("//testing/test.gni")
-
-pdf_use_skia = false
-
-declare_args() {
-  # On Android there's no system FreeType. On Windows and Mac, only a few
-  # methods are used from it.
-  pdfium_bundle_freetype = !is_linux
-}
+import("pdfium.gni")
 
 config("pdfium_config") {
   cflags = []
@@ -25,6 +18,10 @@ config("pdfium_config") {
     defines += [ "_SKIA_SUPPORT_" ]
   }
 
+  if (pdf_enable_v8) {
+    defines += [ "PDF_ENABLE_V8" ]
+  }
+
   if (is_linux) {
     if (current_cpu == "x64") {
       defines += [ "_FX_CPU_=_FX_X64_" ]
@@ -111,7 +108,6 @@ static_library("pdfium") {
     ":fxedit",
     ":fxge",
     ":javascript",
-    ":jsapi",
     ":pdfwindow",
   ]
 
@@ -632,81 +628,66 @@ static_library("pdfwindow") {
 static_library("javascript") {
   sources = [
     "fpdfsdk/include/javascript/IJavaScript.h",
-    "fpdfsdk/src/javascript/Consts.cpp",
-    "fpdfsdk/src/javascript/Consts.h",
-    "fpdfsdk/src/javascript/Document.cpp",
-    "fpdfsdk/src/javascript/Document.h",
-    "fpdfsdk/src/javascript/Field.cpp",
-    "fpdfsdk/src/javascript/Field.h",
-    "fpdfsdk/src/javascript/Icon.cpp",
-    "fpdfsdk/src/javascript/Icon.h",
-    "fpdfsdk/src/javascript/JS_Context.cpp",
-    "fpdfsdk/src/javascript/JS_Context.h",
-    "fpdfsdk/src/javascript/JS_Define.h",
-    "fpdfsdk/src/javascript/JS_EventHandler.cpp",
-    "fpdfsdk/src/javascript/JS_EventHandler.h",
-    "fpdfsdk/src/javascript/JS_GlobalData.cpp",
-    "fpdfsdk/src/javascript/JS_GlobalData.h",
-    "fpdfsdk/src/javascript/JS_Object.cpp",
-    "fpdfsdk/src/javascript/JS_Object.h",
-    "fpdfsdk/src/javascript/JS_Runtime.cpp",
-    "fpdfsdk/src/javascript/JS_Runtime.h",
-    "fpdfsdk/src/javascript/JS_Value.cpp",
-    "fpdfsdk/src/javascript/JS_Value.h",
-    "fpdfsdk/src/javascript/PublicMethods.cpp",
-    "fpdfsdk/src/javascript/PublicMethods.h",
-    "fpdfsdk/src/javascript/app.cpp",
-    "fpdfsdk/src/javascript/app.h",
-    "fpdfsdk/src/javascript/color.cpp",
-    "fpdfsdk/src/javascript/color.h",
-    "fpdfsdk/src/javascript/console.cpp",
-    "fpdfsdk/src/javascript/console.h",
-    "fpdfsdk/src/javascript/event.cpp",
-    "fpdfsdk/src/javascript/event.h",
-    "fpdfsdk/src/javascript/global.cpp",
-    "fpdfsdk/src/javascript/global.h",
-    "fpdfsdk/src/javascript/report.cpp",
-    "fpdfsdk/src/javascript/report.h",
-    "fpdfsdk/src/javascript/resource.cpp",
-    "fpdfsdk/src/javascript/resource.h",
-    "fpdfsdk/src/javascript/util.cpp",
-    "fpdfsdk/src/javascript/util.h",
-  ]
-
-  configs -= [ "//build/config/compiler:chromium_code" ]
-  configs += [
-    ":pdfium_config",
-    "//build/config/compiler:no_chromium_code",
-  ]
-  include_dirs = [
-    "//v8",
-    "//v8/include",
-  ]
-
-  public_deps = [
-    "//v8",
-  ]
-}
-
-static_library("jsapi") {
-  sources = [
-    "fpdfsdk/include/jsapi/fxjs_v8.h",
-    "fpdfsdk/src/jsapi/fxjs_v8.cpp",
   ]
-
+  if (pdf_enable_v8) {
+    sources += [
+      "fpdfsdk/src/javascript/Consts.cpp",
+      "fpdfsdk/src/javascript/Consts.h",
+      "fpdfsdk/src/javascript/Document.cpp",
+      "fpdfsdk/src/javascript/Document.h",
+      "fpdfsdk/src/javascript/Field.cpp",
+      "fpdfsdk/src/javascript/Field.h",
+      "fpdfsdk/src/javascript/Icon.cpp",
+      "fpdfsdk/src/javascript/Icon.h",
+      "fpdfsdk/src/javascript/JS_Context.cpp",
+      "fpdfsdk/src/javascript/JS_Context.h",
+      "fpdfsdk/src/javascript/JS_Define.h",
+      "fpdfsdk/src/javascript/JS_EventHandler.cpp",
+      "fpdfsdk/src/javascript/JS_EventHandler.h",
+      "fpdfsdk/src/javascript/JS_GlobalData.cpp",
+      "fpdfsdk/src/javascript/JS_GlobalData.h",
+      "fpdfsdk/src/javascript/JS_Object.cpp",
+      "fpdfsdk/src/javascript/JS_Object.h",
+      "fpdfsdk/src/javascript/JS_Runtime.cpp",
+      "fpdfsdk/src/javascript/JS_Runtime.h",
+      "fpdfsdk/src/javascript/JS_Value.cpp",
+      "fpdfsdk/src/javascript/JS_Value.h",
+      "fpdfsdk/src/javascript/PublicMethods.cpp",
+      "fpdfsdk/src/javascript/PublicMethods.h",
+      "fpdfsdk/src/javascript/app.cpp",
+      "fpdfsdk/src/javascript/app.h",
+      "fpdfsdk/src/javascript/color.cpp",
+      "fpdfsdk/src/javascript/color.h",
+      "fpdfsdk/src/javascript/console.cpp",
+      "fpdfsdk/src/javascript/console.h",
+      "fpdfsdk/src/javascript/event.cpp",
+      "fpdfsdk/src/javascript/event.h",
+      "fpdfsdk/src/javascript/global.cpp",
+      "fpdfsdk/src/javascript/global.h",
+      "fpdfsdk/src/javascript/report.cpp",
+      "fpdfsdk/src/javascript/report.h",
+      "fpdfsdk/src/javascript/resource.cpp",
+      "fpdfsdk/src/javascript/resource.h",
+      "fpdfsdk/src/javascript/util.cpp",
+      "fpdfsdk/src/javascript/util.h",
+      "fpdfsdk/include/jsapi/fxjs_v8.h",
+      "fpdfsdk/src/jsapi/fxjs_v8.cpp",
+    ]
+    include_dirs = [
+      "//v8",
+      "//v8/include",
+    ]
+    public_deps = [
+      "//v8",
+    ]
+  } else {
+    sources += [ "fpdfsdk/src/javascript/JS_Runtime_Stub.cpp" ]
+  }
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":pdfium_config",
     "//build/config/compiler:no_chromium_code",
   ]
-  include_dirs = [
-    "//v8",
-    "//v8/include",
-  ]
-
-  public_deps = [
-    "//v8",
-  ]
 }
 
 static_library("formfiller") {
@@ -778,7 +759,6 @@ test("pdfium_embeddertests") {
     "fpdfsdk/src/fpdfview_c_api_test.c",
     "fpdfsdk/src/fpdfview_c_api_test.h",
     "fpdfsdk/src/fpdfview_embeddertest.cpp",
-    "fpdfsdk/src/jsapi/fxjs_v8_embeddertest.cpp",
     "testing/embedder_test.cpp",
     "testing/embedder_test.h",
     "testing/embedder_test_mock_delegate.h",
@@ -789,15 +769,24 @@ test("pdfium_embeddertests") {
   deps = [
     "//testing/gmock",
     "//testing/gtest",
-    "//v8",
-    "//v8:v8_libplatform",
     ":pdfium",
   ]
   include_dirs = [
-    "//v8",
-    "//v8/include",
     "."
   ]
+  if (pdf_enable_v8) {
+    sources += [
+     "fpdfsdk/src/jsapi/fxjs_v8_embeddertest.cpp"
+    ]
+    deps += [
+      "//v8",
+      "//v8:v8_libplatform",
+    ]
+    include_dirs += [
+      "//v8",
+      "//v8/include",
+    ]
+  }
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [
     ":pdfium_config",