Fix free memory calculation.

base/process/process_metrics_linux.cc

Index: base/process/process_metrics_linux.cc
diff --git a/base/process/process_metrics_linux.cc b/base/process/process_metrics_linux.cc
index b14aa210bd57af5bd53c6581590fa221f355d9bb..bae922ac6944f974094da2bdb7bc9f99f95a3143 100644
--- a/base/process/process_metrics_linux.cc
+++ b/base/process/process_metrics_linux.cc
@@ -535,7 +535,7 @@ const size_t kDiskWeightedIOTime = 13;
 SystemMemoryInfoKB::SystemMemoryInfoKB() {
   total = 0;
   free = 0;
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_ANDROID)

[Primiano Tucci (use gerrit), 2017/02/15 11:18:33]

i think you can ditch the ifdef at this point, can't think to many example of
_linux && !OS_LINUX && !OS_ANDROID (CrOs counts as OS_LINUX)

[Michael K. (Yandex Team), 2017/02/17 13:38:48]

Done.

   available = 0;
 #endif
   buffers = 0;
@@ -547,6 +547,7 @@ SystemMemoryInfoKB::SystemMemoryInfoKB() {
   swap_total = 0;
   swap_free = 0;
   dirty = 0;
+  reclaimable = 0;
 
   pswpin = 0;
   pswpout = 0;
@@ -568,7 +569,7 @@ std::unique_ptr<Value> SystemMemoryInfoKB::ToValue() const {
 
   res->SetInteger("total", total);
   res->SetInteger("free", free);
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_ANDROID)

[Primiano Tucci (use gerrit), 2017/02/15 11:18:33]

ditto, here an below

[Michael K. (Yandex Team), 2017/02/17 13:38:48]

Done.

   res->SetInteger("available", available);
 #endif
   res->SetInteger("buffers", buffers);
@@ -628,7 +629,7 @@ bool ParseProcMeminfo(const std::string& meminfo_data,
       target = &meminfo->total;
     else if (tokens[0] == "MemFree:")
       target = &meminfo->free;
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_ANDROID)
     else if (tokens[0] == "MemAvailable:")
       target = &meminfo->available;
 #endif
@@ -650,6 +651,8 @@ bool ParseProcMeminfo(const std::string& meminfo_data,
       target = &meminfo->swap_free;
     else if (tokens[0] == "Dirty:")
       target = &meminfo->dirty;
+    else if (tokens[0] == "SReclaimable:")
+      target = &meminfo->reclaimable;
 #if defined(OS_CHROMEOS)
     // Chrome OS has a tweaked kernel that allows us to query Shmem, which is
     // usually video memory otherwise invisible to the OS.