Plugin Power Saver: Make PepperPluginInstanceThrottler interface public.

content/renderer/pepper/pepper_plugin_instance_throttler.cc

Index: content/renderer/pepper/pepper_plugin_instance_throttler.cc
diff --git a/content/renderer/pepper/pepper_plugin_instance_throttler.cc b/content/renderer/pepper/pepper_plugin_instance_throttler.cc
deleted file mode 100644
index 81382093e84ee05fd4966e6754e7617d2a5d1aa3..0000000000000000000000000000000000000000
--- a/content/renderer/pepper/pepper_plugin_instance_throttler.cc
+++ /dev/null
@@ -1,221 +0,0 @@
-// 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/pepper/pepper_plugin_instance_throttler.h"
-
-#include "base/metrics/histogram.h"
-#include "base/metrics/sparse_histogram.h"
-#include "base/time/time.h"
-#include "content/public/common/content_constants.h"
-#include "content/public/renderer/render_thread.h"
-#include "third_party/WebKit/public/web/WebInputEvent.h"
-#include "ui/gfx/color_utils.h"
-#include "url/gurl.h"
-
-namespace content {
-
-namespace {
-
-static const int kInfiniteRatio = 99999;
-
-#define UMA_HISTOGRAM_ASPECT_RATIO(name, width, height) \
-  UMA_HISTOGRAM_SPARSE_SLOWLY(                          \
-      name, (height) ? ((width)*100) / (height) : kInfiniteRatio);
-
-// Histogram tracking prevalence of tiny Flash instances. Units in pixels.
-enum PluginFlashTinyContentSize {
-  TINY_CONTENT_SIZE_1_1 = 0,
-  TINY_CONTENT_SIZE_5_5 = 1,
-  TINY_CONTENT_SIZE_10_10 = 2,
-  TINY_CONTENT_SIZE_LARGE = 3,
-  TINY_CONTENT_SIZE_NUM_ITEMS
-};
-
-const char kFlashClickSizeAspectRatioHistogram[] =
-    "Plugin.Flash.ClickSize.AspectRatio";
-const char kFlashClickSizeHeightHistogram[] = "Plugin.Flash.ClickSize.Height";
-const char kFlashClickSizeWidthHistogram[] = "Plugin.Flash.ClickSize.Width";
-const char kFlashTinyContentSizeHistogram[] = "Plugin.Flash.TinyContentSize";
-const char kPowerSaverUnthrottleHistogram[] = "Plugin.PowerSaver.Unthrottle";
-
-// Record size metrics for all Flash instances.
-void RecordFlashSizeMetric(int width, int height) {
-  PluginFlashTinyContentSize size = TINY_CONTENT_SIZE_LARGE;
-
-  if (width <= 1 && height <= 1)
-    size = TINY_CONTENT_SIZE_1_1;
-  else if (width <= 5 && height <= 5)
-    size = TINY_CONTENT_SIZE_5_5;
-  else if (width <= 10 && height <= 10)
-    size = TINY_CONTENT_SIZE_10_10;
-
-  UMA_HISTOGRAM_ENUMERATION(kFlashTinyContentSizeHistogram, size,
-                            TINY_CONTENT_SIZE_NUM_ITEMS);
-}
-
-void RecordUnthrottleMethodMetric(
-    PepperPluginInstanceThrottler::PowerSaverUnthrottleMethod method) {
-  UMA_HISTOGRAM_ENUMERATION(
-      kPowerSaverUnthrottleHistogram, method,
-      PepperPluginInstanceThrottler::UNTHROTTLE_METHOD_NUM_ITEMS);
-}
-
-// Records size metrics for Flash instances that are clicked.
-void RecordFlashClickSizeMetric(int width, int height) {
-  base::HistogramBase* width_histogram = base::LinearHistogram::FactoryGet(
-      kFlashClickSizeWidthHistogram,
-      0,    // minimum width
-      500,  // maximum width
-      100,  // number of buckets.
-      base::HistogramBase::kUmaTargetedHistogramFlag);
-  width_histogram->Add(width);
-
-  base::HistogramBase* height_histogram = base::LinearHistogram::FactoryGet(
-      kFlashClickSizeHeightHistogram,
-      0,    // minimum height
-      400,  // maximum height
-      100,  // number of buckets.
-      base::HistogramBase::kUmaTargetedHistogramFlag);
-  height_histogram->Add(height);
-
-  UMA_HISTOGRAM_ASPECT_RATIO(kFlashClickSizeAspectRatioHistogram, width,
-                             height);
-}
-
-// When we give up waiting for a suitable preview frame, and simply suspend
-// the plugin where it's at. In milliseconds.
-const int kThrottleTimeout = 5000;
-
-// Threshold for 'boring' score to accept a frame as good enough to be a
-// representative keyframe. Units are the ratio of all pixels that are within
-// the most common luma bin. The same threshold is used for history thumbnails.
-const double kAcceptableFrameMaximumBoringness = 0.94;
-
-const int kMinimumConsecutiveInterestingFrames = 4;
-
-}  // namespace
-
-PepperPluginInstanceThrottler::PepperPluginInstanceThrottler(
-    RenderFrame* frame,
-    const blink::WebRect& bounds,
-    bool is_flash_plugin,
-    const GURL& plugin_url,
-    RenderFrame::PluginPowerSaverMode power_saver_mode,
-    const base::Closure& throttle_change_callback)
-    : bounds_(bounds),
-      throttle_change_callback_(throttle_change_callback),
-      is_flash_plugin_(is_flash_plugin),
-      needs_representative_keyframe_(false),
-      consecutive_interesting_frames_(0),
-      has_been_clicked_(false),
-      power_saver_enabled_(false),
-      is_peripheral_content_(power_saver_mode !=
-                             RenderFrame::POWER_SAVER_MODE_ESSENTIAL),
-      plugin_throttled_(false),
-      weak_factory_(this) {
-  if (is_flash_plugin_ && RenderThread::Get()) {
-    RenderThread::Get()->RecordAction(
-        base::UserMetricsAction("Flash.PluginInstanceCreated"));
-    RecordFlashSizeMetric(bounds.width, bounds.height);
-  }
-
-  power_saver_enabled_ =
-      is_flash_plugin_ &&
-      power_saver_mode == RenderFrame::POWER_SAVER_MODE_PERIPHERAL_THROTTLED;
-
-  GURL content_origin = plugin_url.GetOrigin();
-
-  // To collect UMAs, register peripheral content even if power saver disabled.
-  if (frame) {
-    frame->RegisterPeripheralPlugin(
-        content_origin,
-        base::Bind(&PepperPluginInstanceThrottler::DisablePowerSaver,
-                   weak_factory_.GetWeakPtr(), UNTHROTTLE_METHOD_BY_WHITELIST));
-  }
-
-  if (power_saver_enabled_) {
-    needs_representative_keyframe_ = true;
-    base::MessageLoop::current()->PostDelayedTask(
-        FROM_HERE,
-        base::Bind(&PepperPluginInstanceThrottler::SetPluginThrottled,
-                   weak_factory_.GetWeakPtr(), true /* throttled */),
-        base::TimeDelta::FromMilliseconds(kThrottleTimeout));
-  }
-}
-
-PepperPluginInstanceThrottler::~PepperPluginInstanceThrottler() {
-}
-
-void PepperPluginInstanceThrottler::OnImageFlush(const SkBitmap* bitmap) {
-  if (!needs_representative_keyframe_ || !bitmap)
-    return;
-
-  double boring_score = color_utils::CalculateBoringScore(*bitmap);
-  if (boring_score <= kAcceptableFrameMaximumBoringness)
-    ++consecutive_interesting_frames_;
-  else
-    consecutive_interesting_frames_ = 0;
-
-  if (consecutive_interesting_frames_ >= kMinimumConsecutiveInterestingFrames)
-    SetPluginThrottled(true);
-}
-
-bool PepperPluginInstanceThrottler::ConsumeInputEvent(
-    const blink::WebInputEvent& event) {
-  // Always allow right-clicks through so users may verify it's a plug-in.
-  // TODO(tommycli): We should instead show a custom context menu (probably
-  // using PluginPlaceholder) so users aren't confused and try to click the
-  // Flash-internal 'Play' menu item. This is a stopgap solution.
-  if (event.modifiers & blink::WebInputEvent::Modifiers::RightButtonDown)
-    return false;
-
-  if (!has_been_clicked_ && is_flash_plugin_ &&
-      event.type == blink::WebInputEvent::MouseDown &&
-      (event.modifiers & blink::WebInputEvent::LeftButtonDown)) {
-    has_been_clicked_ = true;
-    RecordFlashClickSizeMetric(bounds_.width, bounds_.height);
-  }
-
-  if (is_peripheral_content_ && event.type == blink::WebInputEvent::MouseUp &&
-      (event.modifiers & blink::WebInputEvent::LeftButtonDown)) {
-    is_peripheral_content_ = false;
-    power_saver_enabled_ = false;
-    needs_representative_keyframe_ = false;
-
-    RecordUnthrottleMethodMetric(UNTHROTTLE_METHOD_BY_CLICK);
-
-    if (plugin_throttled_) {
-      SetPluginThrottled(false /* throttled */);
-      return true;
-    }
-  }
-
-  return plugin_throttled_;
-}
-
-void PepperPluginInstanceThrottler::DisablePowerSaver(
-    PowerSaverUnthrottleMethod method) {
-  if (!is_peripheral_content_)
-    return;
-
-  is_peripheral_content_ = false;
-  power_saver_enabled_ = false;
-  SetPluginThrottled(false);
-
-  RecordUnthrottleMethodMetric(method);
-}
-
-void PepperPluginInstanceThrottler::SetPluginThrottled(bool throttled) {
-  // Do not throttle if we've already disabled power saver.
-  if (!power_saver_enabled_ && throttled)
-    return;
-
-  // Once we change the throttle state, we will never need the snapshot again.
-  needs_representative_keyframe_ = false;
-
-  plugin_throttled_ = throttled;
-  throttle_change_callback_.Run();
-}
-
-}  // namespace content