DCHECK if shader compilation fails that it's due to context loss.

content/common/gpu/client/gl_helper_scaling.h

Index: content/common/gpu/client/gl_helper_scaling.h
diff --git a/content/common/gpu/client/gl_helper_scaling.h b/content/common/gpu/client/gl_helper_scaling.h
index af7b7fc49940c3e83e9799af97981d08a325c7d7..86eeaa30821db2bd58824a33e34318e0d649d1e3 100644
--- a/content/common/gpu/client/gl_helper_scaling.h
+++ b/content/common/gpu/client/gl_helper_scaling.h
@@ -52,6 +52,7 @@ class CONTENT_EXPORT GLHelperScaling {
   typedef std::pair<ShaderType, bool> ShaderProgramKeyType;
 
   GLHelperScaling(gpu::gles2::GLES2Interface* gl,
+                  gpu::ContextSupport* context_support,
                   GLHelper* helper);
   ~GLHelperScaling();
   void InitBuffer();
@@ -191,6 +192,7 @@ class CONTENT_EXPORT GLHelperScaling {
   static const GLfloat kVertexAttributes[];
 
   gpu::gles2::GLES2Interface* gl_;
+  gpu::ContextSupport* context_support_;
   GLHelper* helper_;
 
   // The buffer that holds the vertices and the texture coordinates data for