Syncing task from Mir.

** Changed in: mir (Ubuntu)
   Importance: Undecided => Low

** Changed in: mir (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1666377

Title:
  MIR_CLIENT_PERF_REPORT=log reports "60.00 FPS" but the hardware and
  compositor report correctly report 59.95Hz

Status in Mir:
  Triaged
Status in mir package in Ubuntu:
  Triaged

Bug description:
  MIR_CLIENT_PERF_REPORT=log reports "60.00 FPS":

  [2017-02-21 12:01:15.797764] perf: mir_demo_client_egltriangle.bin:
  60.00 FPS, render time 0.09ms, buffer lag 66.62ms (4 buffers)

  but the correct number is actually 59.95, as shown in three other
  places:

  Window is on output 48: 94 DPI, scale 1.0x, monitor form factor,
  59.95Hz

  [2017-02-21 12:00:27.064036] mirserver:       Current mode 1920x1200
  59.95Hz

  [2017-02-21 12:01:05.806370] compositor: Display 0x7f7ea80008c0
  averaged 59.949 FPS, 0.000 ms/frame, latency 0.093 ms, 60 frames over
  1.000 sec, 100% bypassed

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