Add initial support for NV_path_rendering extension to gpu command buffer

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index b46c252b25905f205a24d3cafc60571fb4ee8a2e..ff0a04f74cd9a4a81c26171d1c248bc7857d6951 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -987,6 +987,9 @@ class GLES2DecoderImpl : public GLES2Decoder,
 
   void DoLoseContextCHROMIUM(GLenum current, GLenum other);
 
+  void DoMatrixLoadfCHROMIUM(GLenum matrix_mode, const GLfloat* matrix);
+  void DoMatrixLoadIdentityCHROMIUM(GLenum matrix_mode);
+
   // Creates a Program for the given program.
   Program* CreateProgram(
       GLuint client_id, GLuint service_id) {
@@ -10660,6 +10663,50 @@ void GLES2DecoderImpl::DoLoseContextCHROMIUM(GLenum current, GLenum other) {
   current_decoder_error_ = error::kLostContext;
 }
 
+void GLES2DecoderImpl::DoMatrixLoadfCHROMIUM(GLenum matrix_mode,
+                                             const GLfloat* matrix) {
+  DCHECK(matrix_mode == GL_PATH_PROJECTION_CHROMIUM ||
+         matrix_mode == GL_PATH_MODELVIEW_CHROMIUM);
+  if (!features().chromium_path_rendering) {
+    LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION,
+                       "glMatrixLoadfCHROMIUM",
+                       "function not available");
+    return;
+  }
+
+  GLfloat* target_matrix = matrix_mode == GL_PATH_PROJECTION_CHROMIUM
+                               ? state_.projection_matrix
+                               : state_.modelview_matrix;
+  memcpy(target_matrix, matrix, sizeof(GLfloat) * 16);
+  // The matrix_mode is either GL_PATH_MODELVIEW_NV or GL_PATH_PROJECTION_NV
+  // since the values of the _NV and _CHROMIUM tokens match.
+  glMatrixLoadfEXT(matrix_mode, matrix);
+}
+
+void GLES2DecoderImpl::DoMatrixLoadIdentityCHROMIUM(GLenum matrix_mode) {
+  DCHECK(matrix_mode == GL_PATH_PROJECTION_CHROMIUM ||
+         matrix_mode == GL_PATH_MODELVIEW_CHROMIUM);
+
+  if (!features().chromium_path_rendering) {
+    LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION,
+                       "glMatrixLoadIdentityCHROMIUM",
+                       "function not available");
+    return;
+  }
+
+  static GLfloat kIdentityMatrix[16] = {1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f,
+                                        0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f,
+                                        0.0f, 0.0f, 0.0f, 1.0f};
+
+  GLfloat* target_matrix = matrix_mode == GL_PATH_PROJECTION_CHROMIUM
+                               ? state_.projection_matrix
+                               : state_.modelview_matrix;
+  memcpy(target_matrix, kIdentityMatrix, sizeof(kIdentityMatrix));
+  // The matrix_mode is either GL_PATH_MODELVIEW_NV or GL_PATH_PROJECTION_NV
+  // since the values of the _NV and _CHROMIUM tokens match.
+  glMatrixLoadIdentityEXT(matrix_mode);
+}
+
 bool GLES2DecoderImpl::ValidateAsyncTransfer(
     const char* function_name,
     TextureRef* texture_ref,