Migrate WebGL contexts on backgrounded tabs to the integrated GPU.

gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h

Index: gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h
diff --git a/gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h b/gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h
index 280f736988c48f6c84ff92bf73a1a2a634372220..03556bce163b2349b79d7057df3af7491da1a6ba 100644
--- a/gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h
+++ b/gpu/command_buffer/service/gles2_cmd_validation_implementation_autogen.h
@@ -655,6 +655,17 @@ bool Validators::PathTransformTypeValidator::IsValid(const GLenum value) const {
   return false;
 };
 
+bool Validators::PerformanceHintModeValidator::IsValid(
+    const GLenum value) const {
+  switch (value) {
+    case GL_DEFAULT_POWER_CHROMIUM:
+    case GL_LOW_POWER_CHROMIUM:
+    case GL_HIGH_PERFORMANCE_CHROMIUM:
+      return true;
+  }
+  return false;
+};
+
 static const GLenum valid_pixel_store_table[] = {
     GL_PACK_ALIGNMENT, GL_UNPACK_ALIGNMENT,
 };