Introduce a client minimum picture pool size

ppapi/proxy/video_decoder_resource.cc

Index: ppapi/proxy/video_decoder_resource.cc
diff --git a/ppapi/proxy/video_decoder_resource.cc b/ppapi/proxy/video_decoder_resource.cc
index bcc0e6e844a8428674bfb6076a1ddcaad397009e..8c7bbbbf41457c572ec46def3dabcc5a9e197598 100644
--- a/ppapi/proxy/video_decoder_resource.cc
+++ b/ppapi/proxy/video_decoder_resource.cc
@@ -62,6 +62,7 @@ VideoDecoderResource::VideoDecoderResource(Connection connection,
                                            PP_Instance instance)
     : PluginResource(connection, instance),
       num_decodes_(0),
+      min_picture_count_(0),
       get_picture_(NULL),
       get_picture_0_1_(NULL),
       gles2_impl_(NULL),
@@ -98,6 +99,19 @@ int32_t VideoDecoderResource::Initialize0_1(
                     allow_software_fallback
                         ? PP_HARDWAREACCELERATION_WITHFALLBACK
                         : PP_HARDWAREACCELERATION_ONLY,
+                    0,
+                    callback);
+}
+
+int32_t VideoDecoderResource::Initialize0_2(
+    PP_Resource graphics_context,
+    PP_VideoProfile profile,
+    PP_HardwareAcceleration acceleration,
+    scoped_refptr<TrackedCallback> callback) {
+  return Initialize(graphics_context,
+                    profile,
+                    acceleration,
+                    0,
                     callback);
 }
 
@@ -105,6 +119,7 @@ int32_t VideoDecoderResource::Initialize(
     PP_Resource graphics_context,
     PP_VideoProfile profile,
     PP_HardwareAcceleration acceleration,
+    uint32_t min_picture_count,
     scoped_refptr<TrackedCallback> callback) {
   if (initialized_)
     return PP_ERROR_FAILED;
@@ -115,6 +130,8 @@ int32_t VideoDecoderResource::Initialize(
   if (!graphics_context)
     return PP_ERROR_BADRESOURCE;
 
+  min_picture_count_ = min_picture_count;
+
   HostResource host_resource;
   if (!testing_) {
     // Create a new Graphics3D resource that can create texture resources to
@@ -144,7 +161,7 @@ int32_t VideoDecoderResource::Initialize(
   Call<PpapiPluginMsg_VideoDecoder_InitializeReply>(
       RENDERER,
       PpapiHostMsg_VideoDecoder_Initialize(
-          host_resource, profile, acceleration),
+          host_resource, profile, acceleration, min_picture_count),
       base::Bind(&VideoDecoderResource::OnPluginMsgInitializeComplete, this));
 
   return PP_OK_COMPLETIONPENDING;
@@ -359,6 +376,7 @@ void VideoDecoderResource::OnPluginMsgRequestTextures(
     uint32_t texture_target,
     const std::vector<gpu::Mailbox>& mailboxes) {
   DCHECK(num_textures);
+  DCHECK(num_textures >= min_picture_count_);
   DCHECK(mailboxes.empty() || mailboxes.size() == num_textures);
   std::vector<uint32_t> texture_ids(num_textures);
   if (gles2_impl_) {