Rename PaintPropertyTreePrinter namepsace to paint_property_tree_printer

https://google.github.io/styleguide/cppguide.html#Namespace_Names
> Namespace names are all lower-case.

This CL has no behavior changes.

Bug: 889726
Change-Id: I150167dadb44bac77af2145f9a87ffa9d0e769c2
Reviewed-on: https://chromium-review.googlesource.com/c/1293291Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Zhuoyu Qian <zhuoyu.qian@samsung.com>
Cr-Commit-Position: refs/heads/master@{#601504}

third_party/blink/renderer/core/paint/paint_property_tree_builder.cc

@@ -98,7 +98,7 @@ void VisualViewportPaintPropertyTreeBuilder::Update(
   context.fixed_position.scroll = visual_viewport.GetScrollNode();
 
 #if DCHECK_IS_ON()
-  PaintPropertyTreePrinter::UpdateDebugNames(visual_viewport);
+  paint_property_tree_printer::UpdateDebugNames(visual_viewport);
 #endif
 }
 
@@ -142,7 +142,7 @@ class FragmentPaintPropertyTreeBuilder {
     }
 #if DCHECK_IS_ON()
     if (properties_)
-      PaintPropertyTreePrinter::UpdateDebugNames(object_, *properties_);
+      paint_property_tree_printer::UpdateDebugNames(object_, *properties_);
 #endif
   }
 

third_party/blink/renderer/core/paint/paint_property_tree_printer.cc

@@ -163,7 +163,7 @@ void SetDebugName(const PropertyTreeNode* node,
 
 }  // namespace
 
-namespace PaintPropertyTreePrinter {
+namespace paint_property_tree_printer {
 
 void UpdateDebugNames(const VisualViewport& viewport) {
   viewport.GetPageScaleNode()->SetDebugName("VisualViewport Scale Node");
@@ -212,7 +212,7 @@ void UpdateDebugNames(const LayoutObject& object,
   SetDebugName(properties.Scroll(), "Scroll", object);
 }
 
-}  // namespace PaintPropertyTreePrinter
+}  // namespace paint_property_tree_printer
 
 }  // namespace blink
 

third_party/blink/renderer/core/paint/paint_property_tree_printer.h

@@ -17,12 +17,12 @@ class LayoutObject;
 class ObjectPaintProperties;
 class VisualViewport;
 
-namespace PaintPropertyTreePrinter {
+namespace paint_property_tree_printer {
 
 void UpdateDebugNames(const VisualViewport&);
 void UpdateDebugNames(const LayoutObject&, ObjectPaintProperties&);
 
-}  // namespace PaintPropertyTreePrinter
+}  // namespace paint_property_tree_printer
 
 }  // namespace blink
 

third_party/blink/tools/blinkpy/presubmit/audit_non_blink_usage.py

@@ -321,6 +321,8 @@ _CONFIG = [
             'cc::ContentLayerClient',
             'cc::DisplayItemList',
             'cc::DrawRecordOp',
+
+            'paint_property_tree_printer::UpdateDebugNames',
         ],
     },
     {