Make chrome/common compile in GN

third_party/adobe/flash/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.
+
+if (is_chrome_branded) {
+  if (is_linux && cpu_arch == "x86") {
+    flapper_version_h_file = "symbols/ppapi/linux/flapper_version.h"
+    flapper_binary_files = [
+      "binaries/ppapi/linux/libpepflashplayer.so",
+      "binaries/ppapi/linux/manifest.json",
+    ]
+  } else if (is_linux && cpu_arch == "x64") {
+    flapper_version_h_file = "symbols/ppapi/linux_x64/flapper_version.h"
+    flapper_binary_files = [
+      "binaries/ppapi/linux_x64/libpepflashplayer.so",
+      "binaries/ppapi/linux_x64/manifest.json",
+    ]
+  } else if (is_mac && cpu_arch == "x86") {
+    flapper_version_h_file = "symbols/ppapi/mac/flapper_version.h"
+    flapper_binary_files = [
+      "binaries/ppapi/mac/PepperFlashPlayer.plugin",
+      "binaries/ppapi/mac/manifest.json",
+    ]
+  } else if (is_mac && cpu_arch == "x64") {
+    flapper_version_h_file = "symbols/ppapi/mac_64/flapper_version.h"
+    flapper_binary_files = [
+      "binaries/ppapi/mac_64/PepperFlashPlayer.plugin",
+      "binaries/ppapi/mac_64/manifest.json",
+    ]
+  } else if (is_win && cpu_arch == "x86") {
+    flapper_version_h_file = "symbols/ppapi/win/flapper_version.h"
+    flapper_binary_files = [
+      "binaries/ppapi/win/pepflashplayer.dll",
+      "binaries/ppapi/win/manifest.json",
+    ]
+  } else if (is_win && cpu_arch == "x64") {
+    flapper_version_h_file = "symbols/ppapi/win_x64/flapper_version.h"
+    flapper_binary_files = [
+      "binaries/ppapi/win_x64/pepflashplayer.dll",
+      "binaries/ppapi/win_x64/manifest.json",
+    ]
+  } else {
+    flapper_version_h_file = "flapper_version.h"
+    flapper_binary_files = []
+  }
+} else {
+  flapper_version_h_file = "flapper_version.h"
+  flapper_binary_files = []
+}
+
+copy("flapper_version_h") {
+  sources = [ flapper_version_h_file ]
+  outputs = [ "$root_gen_dir/{{source_file_part}}" ]
+}
+
+if (flapper_binary_files == []) {
+  group("flapper_binaries") {
+    # NOP
+  }
+} else {
+  copy("flapper_binaries") {
+    sources = flapper_binary_files
+    outputs = [ "$root_out_dir/PepperFlash/{{source_file_part}}" ]
+  }
+}