Initialize arrays before use.

In edited code is possible usage of not initialized array. It's caused
by reason, that GetProgramInfoLog and GetShaderInfoLog functions can end
without filling of the passed array. This error can be detected by MSan.
To fix this problem arrays was initialized before being passed and
printed.

R=aelias@chromium.org
BUG=None
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2600113002
Cr-Commit-Position: refs/heads/master@{#440964}

cc/output/program_binding.cc

@@ -57,7 +57,7 @@ bool ProgramBindingBase::Link(GLES2Interface* context) {
   int linked = 0;
   context->GetProgramiv(program_, GL_LINK_STATUS, &linked);
   if (!linked) {
-    char buffer[1024];
+    char buffer[1024] = "";
     context->GetProgramInfoLog(program_, sizeof(buffer), nullptr, buffer);
     DLOG(ERROR) << "Error compiling shader: " << buffer;
     return false;
@@ -96,7 +96,7 @@ unsigned ProgramBindingBase::LoadShader(GLES2Interface* context,
   int compiled = 0;
   context->GetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
   if (!compiled) {
-    char buffer[1024];
+    char buffer[1024] = "";
     context->GetShaderInfoLog(shader, sizeof(buffer), nullptr, buffer);
     DLOG(ERROR) << "Error compiling shader: " << buffer
                 << "\n shader program: " << shader_source;