command_buffer: Implement glGetStringi for GL ES 3.0

gpu/command_buffer/tests/es3_misc_functions_unittest.cc

Index: gpu/command_buffer/tests/es3_misc_functions_unittest.cc
diff --git a/gpu/command_buffer/tests/es3_misc_functions_unittest.cc b/gpu/command_buffer/tests/es3_misc_functions_unittest.cc
index 6b3ffa96accc76ca7ffb7358a5a00da3c53d9546..634bf1de8f3afeb3dd0191d7171883bc2b07c0ff 100644
--- a/gpu/command_buffer/tests/es3_misc_functions_unittest.cc
+++ b/gpu/command_buffer/tests/es3_misc_functions_unittest.cc
@@ -8,6 +8,7 @@
 #include <GLES3/gl3.h>
 
 #include "base/command_line.h"
+#include "base/strings/string_split.h"
 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ -87,4 +88,26 @@ TEST_F(OpenGLES3FunctionTest, MAYBE_GetFragDataLocationInvalid) {
   glDeleteProgram(program);
 }
 
+TEST_F(OpenGLES3FunctionTest, GetStringiTest) {
+  if (!IsApplicable()) {
+    return;
+  }
+  std::string extensionString =
+      reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
+  std::vector<std::string> extensions =
+      base::SplitString(extensionString, base::kWhitespaceASCII,
+                        base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
+  int num_extensions = 0;
+  glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions);
+  EXPECT_EQ(extensions.size(), static_cast<size_t>(num_extensions));
+  std::set<std::string> extensions_from_string(extensions.begin(),
+                                               extensions.end());
+  std::set<std::string> extensions_from_stringi;
+  for (int i = 0; i < num_extensions; ++i) {
+    extensions_from_stringi.insert(
+        reinterpret_cast<const char*>(glGetStringi(GL_EXTENSIONS, i)));
+  }
+  EXPECT_EQ(extensions_from_string, extensions_from_stringi);
+}
+
 }  // namespace gpu