WebGL 2: make sure VertexAttrib type match the corresponding attrib type in shader

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 42bf2b02895f3e4d7490cb9877c129673c66dd98..7db258199d59dc213437d8502482aa8eba0761be 100644
--- a/gpu/command_buffer/service/program_manager.h
+++ b/gpu/command_buffer/service/program_manager.h
@@ -399,6 +399,14 @@ class GPU_EXPORT Program : public base::RefCounted<Program> {
       return fragment_output_written_mask_;
   }
 
+  // The data are only valid after a successful link.
+  uint32_t vertex_input_type_mask() const {
+      return vertex_input_type_mask_;

[yunchao, 2016/07/20 15:14:30]

A small change here. I'd like to name vertex_input_type_, instead of 
vertex_input_type_mask_, because this variable indeed store base_type for vertex
inputs.
And it is the same thing for fragment_output_type_mask_.

But the variable names of fragment_output_written_mask_ and
vertex_input_written_mask_ would stay the same as they are. Because they
actually store masks. WDYT?  

+  }
+  uint32_t vertex_input_written_mask() const {
+      return vertex_input_written_mask_;
+  }
+
  private:
   friend class base::RefCounted<Program>;
   friend class ProgramManager;
@@ -436,6 +444,7 @@ class GPU_EXPORT Program : public base::RefCounted<Program> {
   void UpdateFragmentInputs();
   void UpdateProgramOutputs();
   void UpdateFragmentOutputBaseTypes();
+  void UpdateVertexInputBaseTypes();
 
   // Process the program log, replacing the hashed names with original names.
   std::string ProcessLogInfo(const std::string& log);
@@ -549,6 +558,13 @@ class GPU_EXPORT Program : public base::RefCounted<Program> {
   // Same layout as above, 2 bits per location, 0x03 if a location is occupied
   // by an output variable, 0x00 if not.
   uint32_t fragment_output_written_mask_;
+
+  // Vertex input variable base types: FLOAT, INT, or UINT.
+  // We have up to 16 outputs, each is encoded into 2 bits, total 32 bits
+  uint32_t vertex_input_type_mask_;
+  // Same layout as above, 2 bits per location, 0x03 if a location is occupied
+  // by an input variable, 0x00 if not.
+  uint32_t vertex_input_written_mask_;
 };
 
 // Tracks the Programs.