Add memcheck suppressions.

tools/valgrind-webrtc/memcheck/suppressions.txt

 # This file is used in addition to the one already maintained in Chrome.
 # It acts as a place holder for future additions for WebRTC.
 # It must exist for the Python wrapper script to work properly.
 
 # There are three kinds of suppressions in this file.
 # 1. third_party libraries
 # 2. webrtc stuff
 # 3. libjingle stuff (talk folder)
 #-----------------------------------------------------------------------
 
@@ skipping 14 matching lines @@
    fun:vfprintf
    fun:vsnprintf
    fun:snprintf
    ...
 }
 
 #-----------------------------------------------------------------------
 # webrtc stuff
 
 {
+   bug_6784
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN3rtc10HttpServer16HandleConnectionEPNS_15StreamInterfaceE
+   fun:_ZN3rtc12_GLOBAL__N_122CreateClientConnectionERNS_10HttpServerERNS0_17HttpServerMonitorEb
+   fun:_ZN3rtc47HttpServer_SignalsCloseAfterForcedCloseAll_Test8TestBodyEv
+}
+{
    bug_6773_3
    Memcheck:Uninitialized
    fun:vfprintf
    fun:vsnprintf
    fun:snprintf
    fun:_ZN7testing12_GLOBAL__N_126PrintByteSegmentInObjectToEPKhmmPSo
    fun:_ZN7testing9internal220PrintBytesInObjectToEPKhmPSo
    fun:_ZN7testing8internal14DefaultPrintToISt6vectorIN6webrtc4rtcp3Fir7RequestESaIS6_EEEEviNS0_13bool_constantILb0EEERKT_PSo
    fun:_ZN7testing8internal20MatchPrintAndExplainIKSt6vectorIN6webrtc4rtcp3Fir7RequestESaIS6_EERS9_EEbRT_RKNS_7MatcherIT0_EEPNS_19MatchResultListenerE
    fun:_ZNK7testing8internal29PredicateFormatterFromMatcherINS0_18ElementsAreMatcherISt5tupleIJNS0_13BothOfMatcherINS_18PolymorphicMatcherINS0_12FieldMatcherIN6webrtc4rtcp3Fir7RequestEjEEEENS5_INS6_ISA_hEEEEEESF_EEEEEclISt6vectorISA_SaISA_EEEENS_15AssertionResultEPKcRKT_
@@ skipping 470 matching lines @@
    fun:pitch_search
    fun:celt_decode_lost
    fun:celt_decode_with_ec
    fun:opus_decode_frame
    ...
    fun:opus_decode_native
    fun:opus_decode
    fun:WebRtcOpus_Decode*
    ...
 }