Add glClientWaitSync to GPU command buffer.

gpu/command_buffer/client/gles2_implementation_unittest.cc

Index: gpu/command_buffer/client/gles2_implementation_unittest.cc
diff --git a/gpu/command_buffer/client/gles2_implementation_unittest.cc b/gpu/command_buffer/client/gles2_implementation_unittest.cc
index 52a2cefa38366b13883d2a9805acb9af860b6b71..d1ac16490dcc2ca47e86d2c9fae5c39653d5b464 100644
--- a/gpu/command_buffer/client/gles2_implementation_unittest.cc
+++ b/gpu/command_buffer/client/gles2_implementation_unittest.cc
@@ -3583,7 +3583,7 @@ TEST_F(GLES2ImplementationTest, IsEnabled) {
   expected.cmd.Init(kCap, result1.id, result1.offset);
 
   EXPECT_CALL(*command_buffer(), OnFlush())
-      .WillOnce(SetMemory(result1.ptr, uint32_t(kCap)))
+      .WillOnce(SetMemory(result1.ptr, uint32_t(GL_TRUE)))
       .RetiresOnSaturation();
 
   GLboolean result = gl_->IsEnabled(kCap);
@@ -3591,6 +3591,31 @@ TEST_F(GLES2ImplementationTest, IsEnabled) {
   EXPECT_TRUE(result);
 }
 
+TEST_F(GLES2ImplementationTest, ClientWaitSync) {
+  const GLuint client_sync_id = 36;
+  struct Cmds {
+    cmds::ClientWaitSync cmd;
+  };
+
+  Cmds expected;
+  ExpectedMemoryInfo result1 =
+      GetExpectedResultMemory(sizeof(cmds::ClientWaitSync::Result));
+  GLuint64Union mapping;
+  mapping.param64 = 0xABCDEF0123456789;
+  expected.cmd.Init(client_sync_id, mapping.param32[0], mapping.param32[1],
+                    result1.id, result1.offset);
+
+  EXPECT_CALL(*command_buffer(), OnFlush())
+      .WillOnce(SetMemory(result1.ptr, uint32_t(GL_CONDITION_SATISFIED)))
+      .RetiresOnSaturation();
+
+  GLenum result = gl_->ClientWaitSync(
+      reinterpret_cast<GLsync>(client_sync_id), GL_SYNC_FLUSH_COMMANDS_BIT,
+      mapping.param64);
+  EXPECT_EQ(0, memcmp(&expected, commands_, sizeof(expected)));
+  EXPECT_EQ(static_cast<GLenum>(GL_CONDITION_SATISFIED), result);
+}
+
 TEST_F(GLES2ImplementationManualInitTest, LoseContextOnOOM) {
   ContextInitOptions init_options;
   init_options.lose_context_when_out_of_memory = true;