[Android] Add support for standalone PDFium gn build on Android.

BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build_overrides/v8.gni")
 import("//testing/test.gni")
 import("pdfium.gni")
 
 config("pdfium_common_config") {
   cflags = []
@@ skipping 1623 matching lines @@
     ]
   }
   if (pdf_enable_v8) {
     sources += [ "fpdfsdk/javascript/public_methods_unittest.cpp" ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
   }
   configs += [ ":pdfium_core_config" ]
+  if (is_android) {
+    ignore_all_data_deps = true
+    use_raw_android_executable = true
+  }
 }
 
 test("pdfium_embeddertests") {
   sources = [
     "core/fpdfapi/fpdf_page/fpdf_page_func_embeddertest.cpp",
     "core/fpdfapi/fpdf_parser/cpdf_parser_embeddertest.cpp",
     "core/fpdfapi/fpdf_parser/cpdf_security_handler_embeddertest.cpp",
     "core/fpdfapi/fpdf_parser/fpdf_parser_decode_embeddertest.cpp",
     "core/fpdfapi/fpdf_render/fpdf_render_loadimage_embeddertest.cpp",
     "core/fpdfapi/fpdf_render/fpdf_render_pattern_embeddertest.cpp",
@@ skipping 33 matching lines @@
       "//v8",
       "//v8:v8_libplatform",
     ]
     include_dirs += [
       "//v8",
       "//v8/include",
     ]
     configs += [ "//v8:external_startup_data" ]
   }
   configs += [ ":pdfium_core_config" ]
+  if (is_android) {
+    ignore_all_data_deps = true
+    use_raw_android_executable = true
+  }
 }
 
 if (pdf_is_standalone) {
   source_set("samples") {
     testonly = true
     deps = [
       "//samples",
     ]
   }
 }