Add utility method for WebString to base::FilePath conversion

third_party/WebKit/Source/platform/BUILD.gn

 # Copyright 2014 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/config/ui.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/platform/platform.gni")
 import("//third_party/WebKit/Source/platform/platform_generated.gni")
 
 # Most targets in this file are private actions so use that as the default.
 visibility = [ ":*" ]
 
 heap_gypi = exec_script("//build/gypi_to_gn.py",
                         [ rebase_path("heap/blink_heap.gypi") ],
                         "scope",
                         [ "heap/blink_heap.gypi" ])
 
 blink_platform_neon_files = [ "graphics/cpu/arm/WebGLImageConversionNEON.h" ]
 
 blink_platform_sse_files = [ "graphics/cpu/x86/WebGLImageConversionSSE.h" ]
 
 # blink_common in blink_platform.gyp
 component("blink_common") {
   visibility = []  # Allow re-assignment of list.
   visibility = [ "//third_party/WebKit/*" ]
   sources = [
+    "exported/FilePathConversion.cpp",
     "exported/URLConversion.cpp",
     "exported/WebCString.cpp",
     "exported/WebCommon.cpp",
     "exported/WebString.cpp",
   ]
 
   defines = [
     "BLINK_COMMON_IMPLEMENTATION=1",
     "INSIDE_BLINK",
   ]
@@ skipping 522 matching lines @@
 }
 
 if (current_cpu == "x86" || current_cpu == "x64") {
   source_set("blink_x86_sse") {
     sources = blink_platform_sse_files
     deps = [
       ":blink_common",
     ]
   }
 }