cpplint.py pass on cc/(base|debug|quads|resources)/

cc/debug/devtools_instrumentation.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_DEBUG_DEVTOOLS_INSTRUMENTATION_H_
 #define CC_DEBUG_DEVTOOLS_INSTRUMENTATION_H_
 
 #include "base/debug/trace_event.h"
 
 namespace cc {
 namespace devtools_instrumentation {
 
 namespace internal {
 const char kCategory[] = "cc,devtools";
 const char kLayerId[] = "layerId";
 const char kPaintLayer[] = "PaintLayer";
 const char kRasterTask[] = "RasterTask";
 }
 
 struct ScopedPaintLayer {
-  ScopedPaintLayer(int layer_id) {
+  explicit ScopedPaintLayer(int layer_id) {
     TRACE_EVENT_BEGIN1(internal::kCategory, internal::kPaintLayer,
         internal::kLayerId, layer_id);
   }
   ~ScopedPaintLayer() {
     TRACE_EVENT_END0(internal::kCategory, internal::kPaintLayer);
   }
 
   DISALLOW_COPY_AND_ASSIGN(ScopedPaintLayer);
 };
 
 struct ScopedRasterTask {
-  ScopedRasterTask(int layer_id) {
+  explicit ScopedRasterTask(int layer_id) {
     TRACE_EVENT_BEGIN1(internal::kCategory, internal::kRasterTask,
         internal::kLayerId, layer_id);
   }
   ~ScopedRasterTask() {
     TRACE_EVENT_END0(internal::kCategory, internal::kRasterTask);
   }
 
   DISALLOW_COPY_AND_ASSIGN(ScopedRasterTask);
 };
 
 struct ScopedLayerObjectTracker
     : public base::debug::TraceScopedTrackableObject<int> {
-  ScopedLayerObjectTracker(int layer_id)
+  explicit ScopedLayerObjectTracker(int layer_id)
       : base::debug::TraceScopedTrackableObject<int>(
             internal::kCategory,
             internal::kLayerId,
             layer_id) {
   }
 
   DISALLOW_COPY_AND_ASSIGN(ScopedLayerObjectTracker);
 };
 
 }  // namespace devtools_instrumentation
 }  // namespace cc
 
 #endif  // CC_DEBUG_DEVTOOLS_INSTRUMENTATION_H_