Use 2 threads for HD, or 1 for VGA or less. BUG=1739 TEST=try bots Review URL: https://webrtc-codereview.appspot.com/1438005
Use 2 threads for HD, or 1 for VGA or less.
BUG=1739
TEST=try bots
Review URL: https://webrtc-codereview.appspot.com/1438005

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@3996 4adac7df-926f-26a2-2b94-8c16560cd09d

android-ia/platform_external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,Omegaphora/external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,MIPS/external-chromium_org-third_party-webrtc,MIPS/external-chromium_org-third_party-webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc