Add subscribeUniform extension pipeline

gpu/command_buffer/service/program_manager.h

Index: gpu/command_buffer/service/program_manager.h
diff --git a/gpu/command_buffer/service/program_manager.h b/gpu/command_buffer/service/program_manager.h
index dbe9c14fa2695770aa1925a14297187507d567ce..af65aea545220316ea5189be0d748a92e6db21ba 100644
--- a/gpu/command_buffer/service/program_manager.h
+++ b/gpu/command_buffer/service/program_manager.h
@@ -39,6 +39,7 @@ class GPU_EXPORT Program : public base::RefCounted<Program> {
   };
 
   enum UniformApiType {
+    kUniformNone = 0,
     kUniform1i = 1 << 0,
     kUniform2i = 1 << 1,
     kUniform3i = 1 << 2,
@@ -95,6 +96,7 @@ class GPU_EXPORT Program : public base::RefCounted<Program> {
   typedef std::vector<VertexAttrib> AttribInfoVector;
   typedef std::vector<int> SamplerIndices;
   typedef std::map<std::string, GLint> LocationMap;
+  typedef base::hash_map<GLint, GLenum> SubscriptionMap;
 
   Program(ProgramManager* manager, GLuint service_id);
 
@@ -191,6 +193,11 @@ class GPU_EXPORT Program : public base::RefCounted<Program> {
     return use_count_ != 0;
   }
 
+  void SetNeedsUpdateSubscriptions();
+  bool needs_update_subscriptions() const {
+    return needs_update_subscriptions_;
+  }
+
   // Sets attribute-location binding from a glBindAttribLocation() call.
   void SetAttribLocationBinding(const std::string& attrib, GLint location) {
     bind_attrib_location_map_[attrib] = location;
@@ -226,11 +233,18 @@ class GPU_EXPORT Program : public base::RefCounted<Program> {
   // varying registers.
   bool CheckVaryingsPacking(VaryingsPackingOption option) const;
 
+  // Subscribe uniform |location| to |target|
+  void AddSubscription(GLint location, GLenum target);
+  // Unsubscribes uniform |location| for any targets
+  void RemoveSubscription(GLint location);
+
   // Visible for testing
   const LocationMap& bind_attrib_location_map() const {
     return bind_attrib_location_map_;
   }
 
+  const SubscriptionMap& subscription_map() const { return subscription_map_; }
+
  private:
   friend class base::RefCounted<Program>;
   friend class ProgramManager;
@@ -348,6 +362,9 @@ class GPU_EXPORT Program : public base::RefCounted<Program> {
   // True if the uniforms have been cleared.
   bool uniforms_cleared_;
 
+  // True if one or more subscription uniforms are out of date
+  bool needs_update_subscriptions_;
+
   // This is different than uniform_infos_.size() because
   // that is a sparce array.
   GLint num_uniforms_;
@@ -360,6 +377,8 @@ class GPU_EXPORT Program : public base::RefCounted<Program> {
 
   // uniform-location binding map from glBindUniformLocationCHROMIUM() calls.
   LocationMap bind_uniform_location_map_;
+
+  SubscriptionMap subscription_map_;
 };
 
 // Tracks the Programs.
@@ -405,8 +424,13 @@ class GPU_EXPORT ProgramManager {
   // Check if a Program is owned by this ProgramManager.
   bool IsOwned(Program* program);
 
+  // Update the active_state of the subscriptions
+  void ActivateUniformSubscriptionState();
+
   static int32 MakeFakeLocation(int32 index, int32 element);
 
+  static Program::UniformApiType ApiTypeForSubscriptionTarget(GLenum target);
+
   uint32 max_varying_vectors() const {
     return max_varying_vectors_;
   }