Fix build break on Mac SDK 10.12.

content/browser/renderer_host/render_widget_host_view_mac_unittest.mm

Index: content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm b/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
index 1131e57394a82302a5fe7dbfd13dcebf68bd0f42..c8c5e835033384a2cb4cebfb27970a98828a7565 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
@@ -1073,8 +1073,9 @@ TEST_F(RenderWidgetHostViewMacTest, PointerEventWithEraserType) {
   base::RunLoop().RunUntilIdle();
   process_host->sink().ClearMessages();
 
-  event = MockMouseEventWithParams(kCGEventMouseMoved, {6, 9}, 0,
-                                   kCGEventMouseSubtypeTabletPoint);
+  event =
+      MockMouseEventWithParams(kCGEventMouseMoved, {6, 9}, kCGMouseButtonLeft,
+                               kCGEventMouseSubtypeTabletPoint);
   [view->cocoa_view() mouseEvent:event];
   ASSERT_EQ(1U, process_host->sink().message_count());
   EXPECT_EQ(blink::WebPointerProperties::PointerType::Eraser,
@@ -1107,8 +1108,9 @@ TEST_F(RenderWidgetHostViewMacTest, PointerEventWithPenType) {
   base::RunLoop().RunUntilIdle();
   process_host->sink().ClearMessages();
 
-  event = MockMouseEventWithParams(kCGEventMouseMoved, {6, 9}, 0,
-                                   kCGEventMouseSubtypeTabletPoint);
+  event =
+      MockMouseEventWithParams(kCGEventMouseMoved, {6, 9}, kCGMouseButtonLeft,
+                               kCGEventMouseSubtypeTabletPoint);
   [view->cocoa_view() mouseEvent:event];
   ASSERT_EQ(1U, process_host->sink().message_count());
   EXPECT_EQ(blink::WebPointerProperties::PointerType::Pen,
@@ -1134,8 +1136,9 @@ TEST_F(RenderWidgetHostViewMacTest, PointerEventWithMouseType) {
   process_host->sink().ClearMessages();
 
   // Send a NSEvent of a mouse type.
-  NSEvent* event = MockMouseEventWithParams(kCGEventMouseMoved, {6, 9}, 0,
-                                            kCGEventMouseSubtypeDefault);
+  NSEvent* event =
+      MockMouseEventWithParams(kCGEventMouseMoved, {6, 9}, kCGMouseButtonLeft,
+                               kCGEventMouseSubtypeDefault);
   [view->cocoa_view() mouseEvent:event];
   ASSERT_EQ(1U, process_host->sink().message_count());
   EXPECT_EQ(blink::WebPointerProperties::PointerType::Mouse,