Pepper: Make sure 'out' params are initialized for all code paths.

Change PPB_ImageData_Proxy and PPB_Instance_Proxy to always initialize
'out' params, to avoid sending uninitialized memory from renderer to
plugin.

BUG=391023

Review URL: https://codereview.chromium.org/383143003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282692 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/proxy/ppb_image_data_proxy.cc

@@ -494,9 +494,7 @@ PP_Resource PPB_ImageData_Proxy::CreateProxyResource(
   }
 
   HostResource result;
-  // Initialize desc so we don't send unitialized memory over IPC.
-  // https://crbug.com/391023.
-  PP_ImageDataDesc desc = {};
+  PP_ImageDataDesc desc;
   switch (type) {
     case PPB_ImageData_Shared::SIMPLE: {
       ppapi::proxy::SerializedHandle image_handle_wrapper;
@@ -622,6 +620,9 @@ void PPB_ImageData_Proxy::OnHostMsgCreatePlatform(
     HostResource* result,
     PP_ImageDataDesc* desc,
     ImageHandle* result_image_handle) {
+  // Clear |desc| so we don't send unitialized memory to the plugin.
+  // https://crbug.com/391023.
+  *desc = PP_ImageDataDesc();
   IPC::PlatformFileForTransit image_handle;
   uint32_t byte_count;
   PP_Resource resource =
@@ -647,6 +648,9 @@ void PPB_ImageData_Proxy::OnHostMsgCreateSimple(
     HostResource* result,
     PP_ImageDataDesc* desc,
     ppapi::proxy::SerializedHandle* result_image_handle) {
+  // Clear |desc| so we don't send unitialized memory to the plugin.
+  // https://crbug.com/391023.
+  *desc = PP_ImageDataDesc();
   IPC::PlatformFileForTransit image_handle;
   uint32_t byte_count;
   PP_Resource resource =