Use PowerSaveBlocker for audio and video on Chrome OS.

content/browser/devtools/render_frame_devtools_agent_host.cc

Index: content/browser/devtools/render_frame_devtools_agent_host.cc
diff --git a/content/browser/devtools/render_frame_devtools_agent_host.cc b/content/browser/devtools/render_frame_devtools_agent_host.cc
index da04255766e6d9a985f7f443360b87ab80292153..c9f046b08c5e4012db730f8898aa01184f35d58c 100644
--- a/content/browser/devtools/render_frame_devtools_agent_host.cc
+++ b/content/browser/devtools/render_frame_devtools_agent_host.cc
@@ -211,11 +211,10 @@ void RenderFrameDevToolsAgentHost::InnerOnClientAttached() {
       render_frame_host_->GetProcess()->GetID());
 
 #if defined(OS_ANDROID)
-  power_save_blocker_.reset(
-      static_cast<PowerSaveBlockerImpl*>(
-          PowerSaveBlocker::Create(
-              PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
-              "DevTools").release()));
+  power_save_blocker_.reset(static_cast<PowerSaveBlockerImpl*>(
+      PowerSaveBlocker::Create(
+          PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep,
+          PowerSaveBlocker::kReasonOther, "DevTools").release()));
   RenderViewHostImpl* rvh = static_cast<RenderViewHostImpl*>(
       render_frame_host_->GetRenderViewHost());
   if (rvh->GetView()) {