Revert "Revert "Rootless Debug for GLES""

This reverts commit 9f20d92fb3b7ed2a88d2e497ec36d21e9005f497.

Test: cts-tradefed run singleCommand cts -m CtsGpuToolsHostTestCases
Test: Chromium starts up
Test: deqp - EGL, GLES2, GLES3
Bug: 110883880
Change-Id: I728ce502f8df43d5bfb370e6f9d4bd382f8c909d
diff --git a/libs/graphicsenv/GraphicsEnv.cpp b/libs/graphicsenv/GraphicsEnv.cpp
index 2a7d76e..3328ad7 100644
--- a/libs/graphicsenv/GraphicsEnv.cpp
+++ b/libs/graphicsenv/GraphicsEnv.cpp
@@ -18,9 +18,12 @@
 #define LOG_TAG "GraphicsEnv"
 #include <graphicsenv/GraphicsEnv.h>
 
+#include <sys/prctl.h>
+
 #include <mutex>
 
 #include <android/dlext.h>
+#include <cutils/properties.h>
 #include <log/log.h>
 
 // TODO(b/37049319) Get this from a header once one exists
@@ -46,6 +49,14 @@
     return env;
 }
 
+int GraphicsEnv::getCanLoadSystemLibraries() {
+    if (property_get_bool("ro.debuggable", false) && prctl(PR_GET_DUMPABLE, 0, 0, 0, 0)) {
+        // Return an integer value since this crosses library boundaries
+        return 1;
+    }
+    return 0;
+}
+
 void GraphicsEnv::setDriverPath(const std::string path) {
     if (!mDriverPath.empty()) {
         ALOGV("ignoring attempt to change driver path from '%s' to '%s'",
@@ -181,4 +192,10 @@
 const char* android_getAngleAppPref() {
     return android::GraphicsEnv::getInstance().getAngleAppPref();
 }
+const char* android_getLayerPaths() {
+    return android::GraphicsEnv::getInstance().getLayerPaths().c_str();
+}
+const char* android_getDebugLayers() {
+    return android::GraphicsEnv::getInstance().getDebugLayers().c_str();
+}
 }