Add the PPAPI X509 Certificate interface and implementation.

ppapi/ppapi_sources.gypi

Index: ppapi/ppapi_sources.gypi
diff --git a/ppapi/ppapi_sources.gypi b/ppapi/ppapi_sources.gypi
index 2770212832c84aa72f1f79955489c3dce8eedef5..67b29761a1a67a0d8f9aa7f6dbcf6bc38cbbc22a 100644
--- a/ppapi/ppapi_sources.gypi
+++ b/ppapi/ppapi_sources.gypi
@@ -97,6 +97,7 @@
       'c/private/ppb_flash_net_connector.h',
       'c/private/ppb_flash_tcp_socket.h',
       'c/private/ppb_flash_udp_socket.h',
+      'c/private/ppb_flash_x509_certificate.h',
       'c/private/ppb_gpu_blacklist_private.h',
       'c/private/ppb_instance_private.h',
       'c/private/ppb_nacl_private.h',
@@ -256,6 +257,8 @@
       'cpp/private/flash_message_loop.h',
       'cpp/private/flash_net_connector.cc',
       'cpp/private/flash_net_connector.h',
+      'cpp/private/flash_x509_certificate.h',
+      'cpp/private/flash_x509_certificate.cc',
       'cpp/private/instance_private.cc',
       'cpp/private/instance_private.h',
       'cpp/private/net_address_private.cc',
@@ -391,6 +394,8 @@
       'tests/test_flash_fullscreen.h',
       'tests/test_flash_message_loop.cc',
       'tests/test_flash_message_loop.h',
+      'tests/test_flash_x509_certificate.h',
+      'tests/test_flash_x509_certificate.cc',
       'tests/test_fullscreen.cc',
       'tests/test_fullscreen.h',
       'tests/test_graphics_2d.cc',