[WebGL 2] primitive restart should be always enabled

gpu/command_buffer/service/buffer_manager.h

Index: gpu/command_buffer/service/buffer_manager.h
diff --git a/gpu/command_buffer/service/buffer_manager.h b/gpu/command_buffer/service/buffer_manager.h
index 33df818647966ed15770dcbe77aa83e0f05e2e55..04623d91755af97fb58d1845779d29942e667be0 100644
--- a/gpu/command_buffer/service/buffer_manager.h
+++ b/gpu/command_buffer/service/buffer_manager.h
@@ -126,6 +126,16 @@ class GPU_EXPORT Buffer : public base::RefCounted<Buffer> {
     GLenum type_;
   };
 
+  struct MaxValue {
+    GLuint max_value_;
+    GLuint max_value_pr_enabled_;
+
+    MaxValue (GLuint value, GLuint value_enabled)
+        : max_value_(value),
+          max_value_pr_enabled_(value_enabled) {
+    }
+  };
+
   ~Buffer();
 
   GLenum initial_target() const {
@@ -196,7 +206,7 @@ class GPU_EXPORT Buffer : public base::RefCounted<Buffer> {
   scoped_ptr<MappedRange> mapped_range_;
 
   // A map of ranges to the highest value in that range of a certain type.
-  typedef std::map<Range, GLuint, Range::Less> RangeToMaxValueMap;
+  typedef std::map<Range, MaxValue, Range::Less> RangeToMaxValueMap;
   RangeToMaxValueMap range_set_;
 };
 
@@ -275,6 +285,8 @@ class GPU_EXPORT BufferManager : public base::trace_event::MemoryDumpProvider {
   bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
                     base::trace_event::ProcessMemoryDump* pmd) override;
 
+  void SetPrimitiveRestartState(bool enabled);
+
  private:
   friend class Buffer;
   friend class TestHelper;  // Needs access to DoBufferData.
@@ -326,6 +338,8 @@ class GPU_EXPORT BufferManager : public base::trace_event::MemoryDumpProvider {
   // Allows to check no Buffer will outlive this.
   unsigned int buffer_count_;
 
+  bool primitive_restart_enabled_;
+
   bool have_context_;
   bool use_client_side_arrays_for_stream_buffers_;