dumpstate: Dump pixel specific trace events at bugreport

At the bugreport, capture pixel tracee vents. It's useful to know
what happened in kernel side at that time.

Test: "adb bugreport" includes the pixel trace dump.
Bug: 238728493
Change-Id: I43a0b0bc51fc9aae7149e461761b798da9fce5e8
Signed-off-by: Minchan Kim <minchan@google.com>

dumpstate/Dumpstate.cpp

@@ -241,6 +241,7 @@ Dumpstate::Dumpstate()
         { "gsc", [this](int fd) { dumpGscSection(fd); } },
         { "trusty", [this](int fd) { dumpTrustySection(fd); } },
         { "led", [this](int fd) { dumpLEDSection(fd); } },
+        { "pixel-trace", [this](int fd) { dumpPixelTraceSection(fd); } },
     },
   mLogSections{
         { "modem", [this](int fd, const std::string &destDir) { dumpModemLogs(fd, destDir); } },
@@ -1308,6 +1309,10 @@ void Dumpstate::dumpLogSection(int fd, int fd_bin)
     RunCommandToFd(fd, "RM LOG", { "/vendor/bin/rm", logCombined.c_str()}, CommandOptions::WithTimeout(2).Build());
 }
 
+void Dumpstate::dumpPixelTraceSection(int fd) {
+    DumpFileToFd(fd, "Pixel trace", "/sys/kernel/tracing/instances/pixel/trace");
+}
+
 ndk::ScopedAStatus Dumpstate::dumpstateBoard(const std::vector<::ndk::ScopedFileDescriptor>& in_fds,
                                              IDumpstateDevice::DumpstateMode in_mode,
                                              int64_t in_timeoutMillis) {

dumpstate/Dumpstate.h

@@ -70,6 +70,7 @@ class Dumpstate : public BnDumpstateDevice {
     void dumpGscSection(int fd);
     void dumpTrustySection(int fd);
     void dumpLEDSection(int fd);
+    void dumpPixelTraceSection(int fd);
 
     void dumpLogSection(int fd, int fdModem);