[PPS] Exclude same-origin tiny plugins.

content/renderer/peripheral_content_heuristic.cc

 // Copyright 2014 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.
 
 #include "content/renderer/peripheral_content_heuristic.h"
 
 #include <cmath>
 
+#include "base/feature_list.h"
+#include "content/public/common/content_features.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace content {
 
 namespace {
 
 // Content below this size in height and width is considered "tiny".
 // Tiny content is never peripheral, as tiny plugins often serve a critical
 // purpose, and the user often cannot find and click to unthrottle it.
 const int kTinyContentSize = 5;
 
 // Cross-origin content must have a width and height both exceeding these
 // minimums to be considered "large", and thus not peripheral.
 const int kLargeContentMinWidth = 398;
 const int kLargeContentMinHeight = 298;
 
 // Mark some 16:9 aspect ratio content as essential (not peripheral). This is to
 // mark as "large" some medium sized video content that meets a minimum area
 // requirement, even if it is below the max width/height above.
 const double kEssentialVideoAspectRatio = 16.0 / 9.0;
 const double kAspectRatioEpsilon = 0.01;
 const int kEssentialVideoMinimumArea = 120000;
 
+bool IsTiny(const gfx::Size& unobscured_size) {
+  // Empty plugins can't be classified as tiny - they might just be of unknown
+  // size.
+  if (unobscured_size.IsEmpty())
+    return false;
+
+  return unobscured_size.width() <= kTinyContentSize &&
+         unobscured_size.height() <= kTinyContentSize;
+}
+
 }  // namespace
 
 // static
 RenderFrame::PeripheralContentStatus
 PeripheralContentHeuristic::GetPeripheralStatus(
     const std::set<url::Origin>& origin_whitelist,
     const url::Origin& main_frame_origin,
     const url::Origin& content_origin,
     const gfx::Size& unobscured_size) {
+  if (base::FeatureList::IsEnabled(features::kFilterSameOriginTinyPlugin) &&
+      IsTiny(unobscured_size)) {
+    return RenderFrame::CONTENT_STATUS_TINY;
+  }
+
   if (main_frame_origin.IsSameOriginWith(content_origin))
     return RenderFrame::CONTENT_STATUS_ESSENTIAL_SAME_ORIGIN;
 
   if (origin_whitelist.count(content_origin))
     return RenderFrame::CONTENT_STATUS_ESSENTIAL_CROSS_ORIGIN_WHITELISTED;
 
   if (unobscured_size.IsEmpty())
     return RenderFrame::CONTENT_STATUS_UNKNOWN_SIZE;
 
-  if (unobscured_size.width() <= kTinyContentSize &&
-      unobscured_size.height() <= kTinyContentSize) {
+  if (IsTiny(unobscured_size))
     return RenderFrame::CONTENT_STATUS_TINY;
-  }
 
   if (IsLargeContent(unobscured_size))
     return RenderFrame::CONTENT_STATUS_ESSENTIAL_CROSS_ORIGIN_BIG;
 
   return RenderFrame::CONTENT_STATUS_PERIPHERAL;
 }
 
 // static
 bool PeripheralContentHeuristic::IsLargeContent(
     const gfx::Size& unobscured_size) {
   int width = unobscured_size.width();
   int height = unobscured_size.height();
   if (width >= kLargeContentMinWidth && height >= kLargeContentMinHeight)
     return true;
 
   double aspect_ratio = static_cast<double>(width) / height;
   if (std::abs(aspect_ratio - kEssentialVideoAspectRatio) <
           kAspectRatioEpsilon &&
       width * height >= kEssentialVideoMinimumArea) {
     return true;
   }
 
   return false;
 }
 
 }  // namespace content