Add benchmarks for symbol reading.

Add a number of benchmarks to time how long it takes to look
up symbols.

Test: Ran benchmarks on device.
Change-Id: Iab7aab3f60c2c7056395beca3d36263420bcb5dc
diff --git a/libunwindstack/Android.bp b/libunwindstack/Android.bp
index 9afc9a3..ab59a4b 100644
--- a/libunwindstack/Android.bp
+++ b/libunwindstack/Android.bp
@@ -373,12 +373,26 @@
 
     srcs: [
         "benchmarks/unwind_benchmarks.cpp",
+        "benchmarks/SymbolBenchmark.cpp",
+    ],
+
+    data: [
+        "benchmarks/files/*",
     ],
 
     shared_libs: [
         "libbase",
         "libunwindstack",
     ],
+
+    target: {
+        android: {
+            static_libs: [
+                "libmeminfo",
+                "libprocinfo",
+            ],
+        },
+    },
 }
 
 // Generates the elf data for use in the tests for .gnu_debugdata frames.