cast: Whitelist libEGL and libGLESv2 provided by ANGLE

These libraries are provided by the build and are installed with
Chromium target. On ARM targets where the sandbox needs to be
initialized early, EGL and GLES libraries need to be whitelisted such
that the GPU process can load them post sandboxing.

BUG=1097320
TEST=Manually on device to verify cast_shell starts.

Change-Id: I38a5de8675501d9d0aa1aa246ff34d0366b2f3bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2282898Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785741}

content/gpu/gpu_sandbox_hook_linux.cc

@@ -252,7 +252,8 @@ void AddArmGpuWhitelist(std::vector<BrokerFilePermission>* permissions) {
 
 // Need to look in vendor paths for custom vendor implementations.
 static const char* const kWhitelistedChromecastPaths[] = {
-    "/oem_cast_shlib/", "/system/vendor/lib/", "/system/lib/"};
+    "/oem_cast_shlib/", "/system/vendor/lib/", "/system/lib/",
+    "/system/chrome/lib/"};
 
 void AddChromecastArmGpuWhitelist(
     std::vector<BrokerFilePermission>* permissions) {
@@ -262,7 +263,9 @@ void AddChromecastArmGpuWhitelist(
 
   // Files needed by the ARM GPU userspace.
   static const char* const kReadOnlyLibraries[] = {"libGLESv2.so.2",
-                                                   "libEGL.so.1"};
+                                                   "libEGL.so.1",
+                                                   // Whitelist ANGLE libraries.
+                                                   "libGLESv2.so", "libEGL.so"};
 
   for (const char* library : kReadOnlyLibraries) {
     for (const char* path : kWhitelistedChromecastPaths) {