Add support for GL_CHROMIUM_consistent_uniform_locations

gpu/command_buffer/common/gles2_cmd_utils_unittest.cc

Index: gpu/command_buffer/common/gles2_cmd_utils_unittest.cc
diff --git a/gpu/command_buffer/common/gles2_cmd_utils_unittest.cc b/gpu/command_buffer/common/gles2_cmd_utils_unittest.cc
index 277461ae7baec6a5ecf73178c72ec8cf0dd89945..d1c2714980a56b92c466e56a418679b71c9268b4 100644
--- a/gpu/command_buffer/common/gles2_cmd_utils_unittest.cc
+++ b/gpu/command_buffer/common/gles2_cmd_utils_unittest.cc
@@ -181,6 +181,17 @@ TEST_F(GLES2UtilTest, RenderbufferBytesPerPixel) {
    EXPECT_EQ(0u, GLES2Util::RenderbufferBytesPerPixel(-1));
 }
 
+TEST_F(GLES2UtilTest, SwizzleLocation) {
+  GLint power = 1;
+  for (GLint p = 0; p < 5; ++p, power *= 10) {
+    GLint limit = power * 20 + 1;
+    for (GLint ii = -limit; ii < limit; ii += power) {
+      GLint s = GLES2Util::SwizzleLocation(ii);
+      EXPECT_EQ(ii, GLES2Util::UnswizzleLocation(s));
+    }
+  }
+}
+
 }  // namespace gles2
 }  // namespace gpu