Add a function to the Flash interface to get the current time zone offset.

TEST=manual
BUG=none
Review URL: http://codereview.chromium.org/6881059

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@82184 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 41 insertions, 1 deletions

diff --git a/ppapi/c/private/ppb_flash.h b/ppapi/c/private/ppb_flash.h
index dbea227..cb33851 100644
--- a/ppapi/c/private/ppb_flash.h
+++ b/ppapi/c/private/ppb_flash.h
@@ -10,9 +10,10 @@
 #include "ppapi/c/pp_point.h"
 #include "ppapi/c/pp_rect.h"
 #include "ppapi/c/pp_resource.h"
+#include "ppapi/c/pp_time.h"
 #include "ppapi/c/pp_var.h"
 
-#define PPB_FLASH_INTERFACE "PPB_Flash;8"
+#define PPB_FLASH_INTERFACE "PPB_Flash;9"
 
 struct PPB_Flash {
   // Sets or clears the rendering hint that the given plugin instance is always
@@ -51,6 +52,9 @@ struct PPB_Flash {
   // Posts a quit message for the outermost nested message loop. Use this to
   // exit and return back to the caller after you call RunMessageLoop.
   void (*QuitMessageLoop)(PP_Instance instance);
+
+  // Retrieves the local time zone offset from GM time for the given UTC time.
+  double (*GetLocalTimeZoneOffset)(PP_Time t);
 };
 
 #endif  // PPAPI_C_PRIVATE_PPB_FLASH_H_
diff --git a/ppapi/proxy/ppb_flash_proxy.cc b/ppapi/proxy/ppb_flash_proxy.cc
index 6e3fcd6..83c9b63 100644
--- a/ppapi/proxy/ppb_flash_proxy.cc
+++ b/ppapi/proxy/ppb_flash_proxy.cc
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "base/message_loop.h"
+#include "base/time.h"
 #include "ppapi/c/dev/ppb_font_dev.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/pp_resource.h"
@@ -127,6 +128,22 @@ void QuitMessageLoop(PP_Instance instance) {
         INTERFACE_ID_PPB_FLASH, instance));
 }
 
+double GetLocalTimeZoneOffset(PP_Time t) {
+  // Somewhat horrible: Explode it to local time and then unexplode it as if
+  // it were UTC. Also explode it to UTC and unexplode it (this avoids
+  // mismatching rounding or lack thereof). The time zone offset is their
+  // difference.
+  //
+  // TODO(brettw) this is duplicated in ppb_flash_impl.cc, unify these!
+  base::Time cur = base::Time::FromDoubleT(t);
+  base::Time::Exploded exploded;
+  cur.LocalExplode(&exploded);
+  base::Time adj_time = base::Time::FromUTCExploded(exploded);
+  cur.UTCExplode(&exploded);
+  cur = base::Time::FromUTCExploded(exploded);
+  return (adj_time - cur).InSecondsF();
+}
+
 const PPB_Flash flash_interface = {
   &SetInstanceAlwaysOnTop,
   &DrawGlyphs,
@@ -134,6 +151,7 @@ const PPB_Flash flash_interface = {
   &Navigate,
   &RunMessageLoop,
   &QuitMessageLoop,
+  &GetLocalTimeZoneOffset
 };
 
 InterfaceProxy* CreateFlashProxy(Dispatcher* dispatcher,
diff --git a/webkit/plugins/ppapi/ppb_flash_impl.cc b/webkit/plugins/ppapi/ppb_flash_impl.cc
index 27415e5..db9be46 100644
--- a/webkit/plugins/ppapi/ppb_flash_impl.cc
+++ b/webkit/plugins/ppapi/ppb_flash_impl.cc
@@ -7,6 +7,7 @@
 #include <string>
 
 #include "base/message_loop.h"
+#include "base/time.h"
 #include "googleurl/src/gurl.h"
 #include "ppapi/c/private/ppb_flash.h"
 #include "webkit/plugins/ppapi/common.h"
@@ -72,6 +73,22 @@ void QuitMessageLoop(PP_Instance instance) {
   MessageLoop::current()->QuitNow();
 }
 
+double GetLocalTimeZoneOffset(PP_Time t) {
+  // Somewhat horrible: Explode it to local time and then unexplode it as if
+  // it were UTC. Also explode it to UTC and unexplode it (this avoids
+  // mismatching rounding or lack thereof). The time zone offset is their
+  // difference.
+  //
+  // TODO(brettw) this is duplicated in ppb_flash_proxy.cc, unify these!
+  base::Time cur = base::Time::FromDoubleT(t);
+  base::Time::Exploded exploded;
+  cur.LocalExplode(&exploded);
+  base::Time adj_time = base::Time::FromUTCExploded(exploded);
+  cur.UTCExplode(&exploded);
+  cur = base::Time::FromUTCExploded(exploded);
+  return (adj_time - cur).InSecondsF();
+}
+
 const PPB_Flash ppb_flash = {
   &SetInstanceAlwaysOnTop,
   &PPB_Flash_Impl::DrawGlyphs,
@@ -79,6 +96,7 @@ const PPB_Flash ppb_flash = {
   &Navigate,
   &RunMessageLoop,
   &QuitMessageLoop,
+  &GetLocalTimeZoneOffset
 };
 
 }  // namespace