Apply varying packing rule.

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 6858cedc2452179567086773146c8a40e8347275..c995e2f2eb39f1143250d79dd85179e3cee2c570 100644
--- a/gpu/command_buffer/service/program_manager.h
+++ b/gpu/command_buffer/service/program_manager.h
@@ -195,6 +195,10 @@ class GPU_EXPORT Program : public base::RefCounted<Program> {
   // is not declared in vertex shader.
   bool DetectVaryingsMismatch() const;
 
+  // Return false if varyings can't be packed into the max available
+  // varying registers.
+  bool CheckVaryingsPacking() const;
+
   // Visible for testing
   const LocationMap& bind_attrib_location_map() const {
     return bind_attrib_location_map_;
@@ -329,7 +333,8 @@ class GPU_EXPORT Program : public base::RefCounted<Program> {
 // need to be shared by multiple GLES2Decoders.
 class GPU_EXPORT ProgramManager {
  public:
-  explicit ProgramManager(ProgramCache* program_cache);
+  explicit ProgramManager(ProgramCache* program_cache,
+                          uint32 max_varying_vectors);
   ~ProgramManager();
 
   // Must call before destruction.
@@ -371,12 +376,19 @@ class GPU_EXPORT ProgramManager {
                        ShaderTranslator* translator,
                        FeatureInfo* feature_info);
 
+  uint32 max_varying_vectors() const {
+    return max_varying_vectors_;
+  }
+
  private:
   friend class Program;
 
   void StartTracking(Program* program);
   void StopTracking(Program* program);
 
+  void RemoveProgramInfoIfUnused(
+      ShaderManager* shader_manager, Program* program);
+
   // Info for each "successfully linked" program by service side program Id.
   // TODO(gman): Choose a faster container.
   typedef std::map<GLuint, scoped_refptr<Program> > ProgramMap;
@@ -395,8 +407,7 @@ class GPU_EXPORT ProgramManager {
 
   ProgramCache* program_cache_;
 
-  void RemoveProgramInfoIfUnused(
-      ShaderManager* shader_manager, Program* program);
+  uint32 max_varying_vectors_;
 
   DISALLOW_COPY_AND_ASSIGN(ProgramManager);
 };